UNIT 2-Diphthong and Silent Letter
 DIPHTHONG                 For spellings consisting of two vowel letters, which especially in English are often not pronounced as two different vowel sounds, see  digraph (orthography) A  diphthong  ( / ˈ d ɪ f θ ɒ ŋ /   DIF-thong  or  / ˈ d ɪ p θ ɒ ŋ /   DIP-thong ; [1]  from  Greek :  δίφθογγος ,  diphthongos , literally "two sounds" or "two tones"), also known as a  gliding vowel , is a combination of two adjacent  vowel  sounds within the same  syllable . Technically, a diphthong is a vowel with two different targets: that is, the tongue (and/or other parts of the  speech apparatus ) moves during the pronunciation of the vowel.             Silent Letter            What is a silent letter? A silent letter is a letter that, in a particular word, does not correspond to any sound in the word’s pronunciation. One of the noted difficulties of English spelling is a high number of s...
