DiphthongsThe two-part vowel sounds and the spellings that signal them.Related learning areasEnglish PronunciationRelated conceptsContractions 'll and won'tDouble consonants in spelling and soundFinal -s and -es — /s/, /z/, and /ɪz/HomophonesIntonation in wh- questionsLinking words togetherQuestionsAll questions in this subjectStart learningStart free practice