diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index 42105e2..335e52f 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -64,11 +64,12 @@
     public static final int NOT_A_VALID_TIMESTAMP = -1;
 
     // Format to get unigram flags from native side via getWordPropertyNative().
-    private static final int FORMAT_WORD_PROPERTY_OUTPUT_FLAG_COUNT = 4;
+    private static final int FORMAT_WORD_PROPERTY_OUTPUT_FLAG_COUNT = 5;
     private static final int FORMAT_WORD_PROPERTY_IS_NOT_A_WORD_INDEX = 0;
     private static final int FORMAT_WORD_PROPERTY_IS_BLACKLISTED_INDEX = 1;
     private static final int FORMAT_WORD_PROPERTY_HAS_BIGRAMS_INDEX = 2;
     private static final int FORMAT_WORD_PROPERTY_HAS_SHORTCUTS_INDEX = 3;
+    private static final int FORMAT_WORD_PROPERTY_IS_BEGINNING_OF_SENTENCE_INDEX = 4;
 
     // Format to get probability and historical info from native side via getWordPropertyNative().
     public static final int FORMAT_WORD_PROPERTY_OUTPUT_PROBABILITY_INFO_COUNT = 4;
@@ -176,10 +177,12 @@
     private static native int getBigramProbabilityNative(long dict, int[] word0,
             boolean isBeginningOfSentence, int[] word1);
     private static native void getWordPropertyNative(long dict, int[] word,
-            int[] outCodePoints, boolean[] outFlags, int[] outProbabilityInfo,
-            ArrayList<int[]> outBigramTargets, ArrayList<int[]> outBigramProbabilityInfo,
-            ArrayList<int[]> outShortcutTargets, ArrayList<Integer> outShortcutProbabilities);
-    private static native int getNextWordNative(long dict, int token, int[] outCodePoints);
+            boolean isBeginningOfSentence, int[] outCodePoints, boolean[] outFlags,
+            int[] outProbabilityInfo, ArrayList<int[]> outBigramTargets,
+            ArrayList<int[]> outBigramProbabilityInfo, ArrayList<int[]> outShortcutTargets,
+            ArrayList<Integer> outShortcutProbabilities);
+    private static native int getNextWordNative(long dict, int token, int[] outCodePoints,
+            boolean[] outIsBeginningOfSentence);
     private static native void getSuggestionsNative(long dict, long proximityInfo,
             long traverseSession, int[] xCoordinates, int[] yCoordinates, int[] times,
             int[] pointerIds, int[] inputCodePoints, int inputSize, int[] suggestOptions,
@@ -358,8 +361,8 @@
                 prevWordsInfo.mIsBeginningOfSentence, codePoints1);
     }
 
-    public WordProperty getWordProperty(final String word) {
-        if (TextUtils.isEmpty(word)) {
+    public WordProperty getWordProperty(final String word, final boolean isBeginningOfSentence) {
+        if (word == null) {
             return null;
         }
         final int[] codePoints = StringUtils.toCodePointArray(word);
@@ -371,14 +374,15 @@
         final ArrayList<int[]> outBigramProbabilityInfo = new ArrayList<>();
         final ArrayList<int[]> outShortcutTargets = new ArrayList<>();
         final ArrayList<Integer> outShortcutProbabilities = new ArrayList<>();
-        getWordPropertyNative(mNativeDict, codePoints, outCodePoints, outFlags, outProbabilityInfo,
-                outBigramTargets, outBigramProbabilityInfo, outShortcutTargets,
-                outShortcutProbabilities);
+        getWordPropertyNative(mNativeDict, codePoints, isBeginningOfSentence, outCodePoints,
+                outFlags, outProbabilityInfo, outBigramTargets, outBigramProbabilityInfo,
+                outShortcutTargets, outShortcutProbabilities);
         return new WordProperty(codePoints,
                 outFlags[FORMAT_WORD_PROPERTY_IS_NOT_A_WORD_INDEX],
                 outFlags[FORMAT_WORD_PROPERTY_IS_BLACKLISTED_INDEX],
                 outFlags[FORMAT_WORD_PROPERTY_HAS_BIGRAMS_INDEX],
-                outFlags[FORMAT_WORD_PROPERTY_HAS_SHORTCUTS_INDEX], outProbabilityInfo,
+                outFlags[FORMAT_WORD_PROPERTY_HAS_SHORTCUTS_INDEX],
+                outFlags[FORMAT_WORD_PROPERTY_IS_BEGINNING_OF_SENTENCE_INDEX], outProbabilityInfo,
                 outBigramTargets, outBigramProbabilityInfo, outShortcutTargets,
                 outShortcutProbabilities);
     }
@@ -399,9 +403,12 @@
      */
     public GetNextWordPropertyResult getNextWordProperty(final int token) {
         final int[] codePoints = new int[Constants.DICTIONARY_MAX_WORD_LENGTH];
-        final int nextToken = getNextWordNative(mNativeDict, token, codePoints);
+        final boolean[] isBeginningOfSentence = new boolean[1];
+        final int nextToken = getNextWordNative(mNativeDict, token, codePoints,
+                isBeginningOfSentence);
         final String word = StringUtils.getStringFromNullTerminatedCodePointArray(codePoints);
-        return new GetNextWordPropertyResult(getWordProperty(word), nextToken);
+        return new GetNextWordPropertyResult(
+                getWordProperty(word, isBeginningOfSentence[0]), nextToken);
     }
 
     // Add a unigram entry to binary dictionary with unigram attributes in native code.
diff --git a/java/src/com/android/inputmethod/latin/makedict/WordProperty.java b/java/src/com/android/inputmethod/latin/makedict/WordProperty.java
index 31cb597..cd78e22 100644
--- a/java/src/com/android/inputmethod/latin/makedict/WordProperty.java
+++ b/java/src/com/android/inputmethod/latin/makedict/WordProperty.java
@@ -70,8 +70,8 @@
     // Construct word property using information from native code.
     // This represents invalid word when the probability is BinaryDictionary.NOT_A_PROBABILITY.
     public WordProperty(final int[] codePoints, final boolean isNotAWord,
-            final boolean isBlacklisted, final boolean hasBigram,
-            final boolean hasShortcuts, final int[] probabilityInfo,
+            final boolean isBlacklisted, final boolean hasBigram, final boolean hasShortcuts,
+            final boolean isBeginningOfSentence, final int[] probabilityInfo,
             final ArrayList<int[]> bigramTargets, final ArrayList<int[]> bigramProbabilityInfo,
             final ArrayList<int[]> shortcutTargets,
             final ArrayList<Integer> shortcutProbabilities) {
@@ -79,7 +79,7 @@
         mProbabilityInfo = createProbabilityInfoFromArray(probabilityInfo);
         mShortcutTargets = new ArrayList<>();
         mBigrams = new ArrayList<>();
-        mIsBeginningOfSentence = false;
+        mIsBeginningOfSentence = isBeginningOfSentence;
         mIsNotAWord = isNotAWord;
         mIsBlacklistEntry = isBlacklisted;
         mHasShortcuts = hasShortcuts;
diff --git a/java/src/com/android/inputmethod/latin/utils/CombinedFormatUtils.java b/java/src/com/android/inputmethod/latin/utils/CombinedFormatUtils.java
index c660075..34f59e8 100644
--- a/java/src/com/android/inputmethod/latin/utils/CombinedFormatUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/CombinedFormatUtils.java
@@ -31,6 +31,7 @@
     public static final String HISTORICAL_INFO_TAG = "historicalInfo";
     public static final String HISTORICAL_INFO_SEPARATOR = ":";
     public static final String WORD_TAG = "word";
+    public static final String BEGINNING_OF_SENTENCE_TAG = "beginning_of_sentence";
     public static final String NOT_A_WORD_TAG = "not_a_word";
     public static final String BLACKLISTED_TAG = "blacklisted";
 
@@ -56,6 +57,9 @@
         builder.append(" " + WORD_TAG + "=" + wordProperty.mWord);
         builder.append(",");
         builder.append(formatProbabilityInfo(wordProperty.mProbabilityInfo));
+        if (wordProperty.mIsBeginningOfSentence) {
+            builder.append("," + BEGINNING_OF_SENTENCE_TAG + "=true");
+        }
         if (wordProperty.mIsNotAWord) {
             builder.append("," + NOT_A_WORD_TAG + "=true");
         }
diff --git a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
index c2cd2ad..2654a4a 100644
--- a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
+++ b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
@@ -301,7 +301,7 @@
 // If token is 0, this method newly starts iterating the dictionary. This method returns 0 when
 // the dictionary does not have a next word.
 static jint latinime_BinaryDictionary_getNextWord(JNIEnv *env, jclass clazz,
-        jlong dict, jint token, jintArray outCodePoints) {
+        jlong dict, jint token, jintArray outCodePoints, jbooleanArray outIsBeginningOfSentence) {
     Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);
     if (!dictionary) return 0;
     const jsize codePointBufSize = env->GetArrayLength(outCodePoints);
@@ -317,19 +317,39 @@
     JniDataUtils::outputCodePoints(env, outCodePoints, 0 /* start */,
             MAX_WORD_LENGTH /* maxLength */, wordCodePoints, wordCodePointCount,
             false /* needsNullTermination */);
+    bool isBeginningOfSentence = false;
+    if (wordCodePointCount > 0 && wordCodePoints[0] == CODE_POINT_BEGINNING_OF_SENTENCE) {
+        isBeginningOfSentence = true;
+    }
+    JniDataUtils::putBooleanToArray(env, outIsBeginningOfSentence, 0 /* index */,
+            isBeginningOfSentence);
     return nextToken;
 }
 
 static void latinime_BinaryDictionary_getWordProperty(JNIEnv *env, jclass clazz,
-        jlong dict, jintArray word, jintArray outCodePoints, jbooleanArray outFlags,
-        jintArray outProbabilityInfo, jobject outBigramTargets, jobject outBigramProbabilityInfo,
-        jobject outShortcutTargets, jobject outShortcutProbabilities) {
+        jlong dict, jintArray word, jboolean isBeginningOfSentence, jintArray outCodePoints,
+        jbooleanArray outFlags, jintArray outProbabilityInfo, jobject outBigramTargets,
+        jobject outBigramProbabilityInfo, jobject outShortcutTargets,
+        jobject outShortcutProbabilities) {
     Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);
     if (!dictionary) return;
     const jsize wordLength = env->GetArrayLength(word);
-    int wordCodePoints[wordLength];
+    if (wordLength > MAX_WORD_LENGTH) {
+        AKLOGE("Invalid wordLength: %d", wordLength);
+        return;
+    }
+    int wordCodePoints[MAX_WORD_LENGTH];
     env->GetIntArrayRegion(word, 0, wordLength, wordCodePoints);
-    const WordProperty wordProperty = dictionary->getWordProperty(wordCodePoints, wordLength);
+    int codePointCount = wordLength;
+    if (isBeginningOfSentence) {
+        codePointCount = CharUtils::attachBeginningOfSentenceMarker(
+                wordCodePoints, wordLength, MAX_WORD_LENGTH);
+        if (codePointCount < 0) {
+            AKLOGE("Cannot attach Beginning-of-Sentence marker.");
+            return;
+        }
+    }
+    const WordProperty wordProperty = dictionary->getWordProperty(wordCodePoints, codePointCount);
     wordProperty.outputProperties(env, outCodePoints, outFlags, outProbabilityInfo,
             outBigramTargets, outBigramProbabilityInfo, outShortcutTargets,
             outShortcutProbabilities);
@@ -554,7 +574,6 @@
         return false;
     }
 
-    // TODO: Migrate historical information.
     int wordCodePoints[MAX_WORD_LENGTH];
     int wordCodePointCount = 0;
     int token = 0;
@@ -563,6 +582,10 @@
         token = dictionary->getNextWordAndNextToken(token, wordCodePoints, &wordCodePointCount);
         const WordProperty wordProperty = dictionary->getWordProperty(wordCodePoints,
                 wordCodePointCount);
+        if (wordCodePoints[0] == CODE_POINT_BEGINNING_OF_SENTENCE) {
+            // Skip beginning-of-sentence unigram.
+            continue;
+        }
         if (dictionaryStructureWithBufferPolicy->needsToRunGC(true /* mindsBlockByGC */)) {
             dictionaryStructureWithBufferPolicy = runGCAndGetNewStructurePolicy(
                     std::move(dictionaryStructureWithBufferPolicy), dictFilePathChars);
@@ -592,7 +615,7 @@
             }
         }
         const PrevWordsInfo prevWordsInfo(wordCodePoints, wordCodePointCount,
-                false /* isBeginningOfSentence */);
+                wordProperty.getUnigramProperty()->representsBeginningOfSentence());
         for (const BigramProperty &bigramProperty : *wordProperty.getBigramProperties()) {
             if (!dictionaryStructureWithBufferPolicy->addNgramEntry(&prevWordsInfo,
                     &bigramProperty)) {
@@ -669,13 +692,13 @@
     },
     {
         const_cast<char *>("getWordPropertyNative"),
-        const_cast<char *>("(J[I[I[Z[ILjava/util/ArrayList;Ljava/util/ArrayList;"
+        const_cast<char *>("(J[IZ[I[Z[ILjava/util/ArrayList;Ljava/util/ArrayList;"
                 "Ljava/util/ArrayList;Ljava/util/ArrayList;)V"),
         reinterpret_cast<void *>(latinime_BinaryDictionary_getWordProperty)
     },
     {
         const_cast<char *>("getNextWordNative"),
-        const_cast<char *>("(JI[I)I"),
+        const_cast<char *>("(JI[I[Z)I"),
         reinterpret_cast<void *>(latinime_BinaryDictionary_getNextWord)
     },
     {
diff --git a/native/jni/src/suggest/core/dictionary/property/word_property.cpp b/native/jni/src/suggest/core/dictionary/property/word_property.cpp
index 6f5f808..5bdd560 100644
--- a/native/jni/src/suggest/core/dictionary/property/word_property.cpp
+++ b/native/jni/src/suggest/core/dictionary/property/word_property.cpp
@@ -28,7 +28,8 @@
             MAX_WORD_LENGTH /* maxLength */, mCodePoints.data(), mCodePoints.size(),
             false /* needsNullTermination */);
     jboolean flags[] = {mUnigramProperty.isNotAWord(), mUnigramProperty.isBlacklisted(),
-            !mBigrams.empty(), mUnigramProperty.hasShortcuts()};
+            !mBigrams.empty(), mUnigramProperty.hasShortcuts(),
+            mUnigramProperty.representsBeginningOfSentence()};
     env->SetBooleanArrayRegion(outFlags, 0 /* start */, NELEMS(flags), flags);
     int probabilityInfo[] = {mUnigramProperty.getProbability(), mUnigramProperty.getTimestamp(),
             mUnigramProperty.getLevel(), mUnigramProperty.getCount()};
diff --git a/native/jni/src/utils/char_utils.h b/native/jni/src/utils/char_utils.h
index f28ed56..6378650 100644
--- a/native/jni/src/utils/char_utils.h
+++ b/native/jni/src/utils/char_utils.h
@@ -98,6 +98,10 @@
     // Beginning-of-Sentence.
     static AK_FORCE_INLINE int attachBeginningOfSentenceMarker(int *const codePoints,
             const int codePointCount, const int maxCodePoint) {
+        if (codePointCount > 0 && codePoints[0] == CODE_POINT_BEGINNING_OF_SENTENCE) {
+            // Marker has already been attached.
+            return codePointCount;
+        }
         if (codePointCount >= maxCodePoint) {
             // the code points cannot be marked as a Beginning-of-Sentence.
             return 0;
diff --git a/native/jni/src/utils/jni_data_utils.h b/native/jni/src/utils/jni_data_utils.h
index 67a66fd..3514aee 100644
--- a/native/jni/src/utils/jni_data_utils.h
+++ b/native/jni/src/utils/jni_data_utils.h
@@ -69,18 +69,23 @@
     static void outputCodePoints(JNIEnv *env, jintArray intArrayToOutputCodePoints, const int start,
             const int maxLength, const int *const codePoints, const int codePointCount,
             const bool needsNullTermination) {
-        const int outputCodePointCount = std::min(maxLength, codePointCount);
-        int outputCodePonts[outputCodePointCount];
-        for (int i = 0; i < outputCodePointCount; ++i) {
+        const int codePointBufSize = std::min(maxLength, codePointCount);
+        int outputCodePonts[codePointBufSize];
+        int outputCodePointCount = 0;
+        for (int i = 0; i < codePointBufSize; ++i) {
             const int codePoint = codePoints[i];
+            int codePointToOutput = codePoint;
             if (!CharUtils::isInUnicodeSpace(codePoint)) {
-                outputCodePonts[i] = CODE_POINT_REPLACEMENT_CHARACTER;
+                if (codePoint == CODE_POINT_BEGINNING_OF_SENTENCE) {
+                    // Just skip Beginning-of-Sentence marker.
+                    continue;
+                }
+                codePointToOutput = CODE_POINT_REPLACEMENT_CHARACTER;
             } else if (codePoint >= 0x01 && codePoint <= 0x1F) {
                 // Control code.
-                outputCodePonts[i] = CODE_POINT_REPLACEMENT_CHARACTER;
-            } else {
-                outputCodePonts[i] = codePoint;
+                codePointToOutput = CODE_POINT_REPLACEMENT_CHARACTER;
             }
+            outputCodePonts[outputCodePointCount++] = codePointToOutput;
         }
         env->SetIntArrayRegion(intArrayToOutputCodePoints, start, outputCodePointCount,
                 outputCodePonts);
@@ -90,6 +95,11 @@
         }
     }
 
+    static void putBooleanToArray(JNIEnv *env, jbooleanArray array, const int index,
+            const jboolean value) {
+        env->SetBooleanArrayRegion(array, index, 1 /* len */, &value);
+    }
+
     static void putIntToArray(JNIEnv *env, jintArray array, const int index, const int value) {
         env->SetIntArrayRegion(array, index, 1 /* len */, &value);
     }
diff --git a/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java b/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
index 160b08c..83ea193 100644
--- a/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
+++ b/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
@@ -994,7 +994,8 @@
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
                 Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
 
-        final WordProperty invalidWordProperty = binaryDictionary.getWordProperty("dummyWord");
+        final WordProperty invalidWordProperty = binaryDictionary.getWordProperty("dummyWord",
+                false /* isBeginningOfSentence */);
         assertFalse(invalidWordProperty.isValid());
 
         final ArrayList<String> words = new ArrayList<>();
@@ -1017,7 +1018,8 @@
             }
             words.add(word);
             wordProbabilities.put(word, unigramProbability);
-            final WordProperty wordProperty = binaryDictionary.getWordProperty(word);
+            final WordProperty wordProperty = binaryDictionary.getWordProperty(word,
+                    false /* isBeginningOfSentence */);
             assertEquals(word, wordProperty.mWord);
             assertTrue(wordProperty.isValid());
             assertEquals(isNotAWord, wordProperty.mIsNotAWord);
@@ -1057,7 +1059,8 @@
                 continue;
             }
             final HashSet<String> bigramWord1s = bigrams.get(word0);
-            final WordProperty wordProperty = binaryDictionary.getWordProperty(word0);
+            final WordProperty wordProperty = binaryDictionary.getWordProperty(word0,
+                    false /* isBeginningOfSentence */);
             assertEquals(bigramWord1s.size(), wordProperty.mBigrams.size());
             for (int j = 0; j < wordProperty.mBigrams.size(); j++) {
                 final String word1 = wordProperty.mBigrams.get(j).mWord;
@@ -1094,7 +1097,8 @@
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
                 Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
 
-        final WordProperty invalidWordProperty = binaryDictionary.getWordProperty("dummyWord");
+        final WordProperty invalidWordProperty = binaryDictionary.getWordProperty("dummyWord",
+                false /* isBeginningOfSentence */);
         assertFalse(invalidWordProperty.isValid());
 
         final ArrayList<String> words = new ArrayList<>();
@@ -1188,7 +1192,8 @@
         binaryDictionary.addUnigramEntry("aaa", unigramProbability, "zzz",
                 shortcutProbability, false /* isBeginningOfSentence */,
                 false /* isNotAWord */, false /* isBlacklisted */, 0 /* timestamp */);
-        WordProperty wordProperty = binaryDictionary.getWordProperty("aaa");
+        WordProperty wordProperty = binaryDictionary.getWordProperty("aaa",
+                false /* isBeginningOfSentence */);
         assertEquals(1, wordProperty.mShortcutTargets.size());
         assertEquals("zzz", wordProperty.mShortcutTargets.get(0).mWord);
         assertEquals(shortcutProbability, wordProperty.mShortcutTargets.get(0).getProbability());
@@ -1196,7 +1201,8 @@
         binaryDictionary.addUnigramEntry("aaa", unigramProbability, "zzz",
                 updatedShortcutProbability, false /* isBeginningOfSentence */,
                 false /* isNotAWord */, false /* isBlacklisted */, 0 /* timestamp */);
-        wordProperty = binaryDictionary.getWordProperty("aaa");
+        wordProperty = binaryDictionary.getWordProperty("aaa",
+                false /* isBeginningOfSentence */);
         assertEquals(1, wordProperty.mShortcutTargets.size());
         assertEquals("zzz", wordProperty.mShortcutTargets.get(0).mWord);
         assertEquals(updatedShortcutProbability,
@@ -1207,7 +1213,8 @@
         final HashMap<String, Integer> shortcutTargets = new HashMap<>();
         shortcutTargets.put("zzz", updatedShortcutProbability);
         shortcutTargets.put("yyy", shortcutProbability);
-        wordProperty = binaryDictionary.getWordProperty("aaa");
+        wordProperty = binaryDictionary.getWordProperty("aaa",
+                false /* isBeginningOfSentence */);
         assertEquals(2, wordProperty.mShortcutTargets.size());
         for (WeightedString shortcutTarget : wordProperty.mShortcutTargets) {
             assertTrue(shortcutTargets.containsKey(shortcutTarget.mWord));
@@ -1218,7 +1225,8 @@
         shortcutTargets.put("zzz", updatedShortcutProbability);
         shortcutTargets.put("yyy", shortcutProbability);
         binaryDictionary.flushWithGC();
-        wordProperty = binaryDictionary.getWordProperty("aaa");
+        wordProperty = binaryDictionary.getWordProperty("aaa",
+                false /* isBeginningOfSentence */);
         assertEquals(2, wordProperty.mShortcutTargets.size());
         for (WeightedString shortcutTarget : wordProperty.mShortcutTargets) {
             assertTrue(shortcutTargets.containsKey(shortcutTarget.mWord));
@@ -1288,7 +1296,8 @@
         }
 
         for (final String word : words) {
-            final WordProperty wordProperty = binaryDictionary.getWordProperty(word);
+            final WordProperty wordProperty = binaryDictionary.getWordProperty(word,
+                    false /* isBeginningOfSentence */);
             assertEquals((int)unigramProbabilities.get(word),
                     wordProperty.mProbabilityInfo.mProbability);
             if (!shortcutTargets.containsKey(word)) {
@@ -1332,6 +1341,8 @@
         binaryDictionary.addUnigramEntry("ddd", unigramProbability, null /* shortcutTarget */,
                 Dictionary.NOT_A_PROBABILITY, false /* isBeginningOfSentence */,
                 true /* isNotAWord */, true /* isBlacklisted */, 0 /* timestamp */);
+        binaryDictionary.addNgramEntry(PrevWordsInfo.BEGINNING_OF_SENTENCE,
+                "aaa", bigramProbability, 0 /* timestamp */);
         assertEquals(unigramProbability, binaryDictionary.getFrequency("aaa"));
         assertEquals(unigramProbability, binaryDictionary.getFrequency("bbb"));
         assertTrue(isValidBigram(binaryDictionary, "aaa", "bbb"));
@@ -1343,12 +1354,16 @@
         assertEquals(unigramProbability, binaryDictionary.getFrequency("bbb"));
         if (canCheckBigramProbability(toFormatVersion)) {
             assertEquals(bigramProbability, getBigramProbability(binaryDictionary, "aaa", "bbb"));
+            assertEquals(bigramProbability, binaryDictionary.getNgramProbability(
+                    PrevWordsInfo.BEGINNING_OF_SENTENCE, "aaa"));
         }
         assertTrue(isValidBigram(binaryDictionary, "aaa", "bbb"));
-        WordProperty wordProperty = binaryDictionary.getWordProperty("ccc");
+        WordProperty wordProperty = binaryDictionary.getWordProperty("ccc",
+                false /* isBeginningOfSentence */);
         assertEquals(1, wordProperty.mShortcutTargets.size());
         assertEquals("xxx", wordProperty.mShortcutTargets.get(0).mWord);
-        wordProperty = binaryDictionary.getWordProperty("ddd");
+        wordProperty = binaryDictionary.getWordProperty("ddd",
+                false /* isBeginningOfSentence */);
         assertTrue(wordProperty.mIsBlacklistEntry);
         assertTrue(wordProperty.mIsNotAWord);
     }
diff --git a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
index 4b332ca..406046a 100644
--- a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
+++ b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
@@ -614,7 +614,8 @@
                 0 /* offset */, file.length(), true /* useFullEditDistance */,
                 Locale.ENGLISH, dictName, false /* isUpdatable */);
         for (final String word : words) {
-            final WordProperty wordProperty = binaryDictionary.getWordProperty(word);
+            final WordProperty wordProperty = binaryDictionary.getWordProperty(word,
+                    false /* isBeginningOfSentence */);
             assertEquals(word, wordProperty.mWord);
             assertEquals(UNIGRAM_FREQ, wordProperty.getProbability());
             if (shortcuts.containsKey(word)) {