Hye guys!!!Today I learn something new.Today I learned about DIPHTHONG . Do you know what is Diphthong ? = a sound formed by the combination of two vowels in a single syllable, in which the sound begins as one vowel and moves towards another (as in coin , loud , and side ). This video explain more about it While SILENT LETTER meaning is a letter that, in a particular word , does not correspond to any sound in the word's pronunciation . Phonetic transcriptions that better depict pronunciation and which note changes due to grammar and proximity of other words require a symbol to show that the letter is mute.