### Question:
WordTransformer { public static String getPastParticiple(String verb) { if (verb.isEmpty()) { return verb; } String stemmedWord = stemEnglishWord(verb); EnglishVerb englishVerb = IRREGULAR_VERBS.get(stemmedWord); if (englishVerb != null) { return englishVerb.getPastParticiple(); } return getRegularVerbPast(stemmedWord); }  static String wordToSingular(String pluralForm, Language language); static String wordToSingularEnglish(String pluralForm); static String wordToSingularGerman(String pluralForm); static String wordToSingularGermanCaseSensitive(String lowerCasePluralForm); static List<String> splitGermanCompoundWords(String word); static String wordToPlural(String singular, Language language); static String wordToPluralCaseSensitive(String lowercaseSingular, Language language); static String wordToPluralEnglish(String singular); static String wordToPluralEnglishCaseSensitive(String lowercaseSingular); static String wordToPluralGerman(String singular); static String wordToPluralGermanCaseSensitive(String lowerCaseWord); static String stemGermanWords(String words); static String stemEnglishWords(String words); static String stemWords(String words, Language language); static String stemWord(String word, Language language); static String stemGermanWord(String word); static String stemEnglishWord(String word); static void addStemmingException(String original, String stemmed, Language language); static String getThirdPersonSingular(String verb); static String getSimplePresent(String verb); static String getSimplePast(String verb); static String getPastParticiple(String verb); static EnglishTense getTense(String string, AbstractPosTagger posTagger); static EnglishTense getTense(String string, List<Annotation> annotations); static void main(String[] args);  }### Answer:
@Test public void testGetPastParticiple() { assertEquals("caused", WordTransformer.getPastParticiple("causes")); assertEquals("jumped", WordTransformer.getPastParticiple("jump")); assertEquals("jumped", WordTransformer.getPastParticiple("jumped")); assertEquals("equipped", WordTransformer.getPastParticiple("equip")); assertEquals("tried", WordTransformer.getPastParticiple("tried")); assertEquals("found", WordTransformer.getPastParticiple("find")); assertEquals("grated", WordTransformer.getPastParticiple("grate")); assertEquals("gone", WordTransformer.getPastParticiple("go")); }