Question

why we use silent words like .knife .knowledge.
we will no use why​

Answer 1

here is your answer.....

Silent letters are the ghosts of pronunciations past. The word 'knight', with its silent 'k', and silent 'gh', is cognate with the German word for servant, 'knecht', where every letter is pronounced.

Silent 'e' (eg, tot vs tote) is a bit more of a complicated story. In Chaucer's day, the 'e' was pronounced. So, in a word like 'bite' (not a real old-English example, but simpler for exposition) the 'e' at the end would have meant that the word was pronounced bi.te, with two syllables. In the Germanic language, open syllables had long vowels, so 'bit' would be short 'i', 'bite' would be long. Nowadays, the distinction between long and short vowels in English is actually more than just length because of the Great Vowel Shift.

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