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You would use an, because the word starts with a vowel sound.
* Gnat * Gnaw * Knee * Know * Knew * Knit
what word is silent in thoroughly
an hour An hour. The rule is, use a if the next word following it starts with a consonant sound. Use an if it starts with a vowel sound. Since in the word hour, the h is silent, that means it actually starts with the sound of the o, a vowel.
The 'w' is silent in the word "answer".
There is no silent letter in the word "black" c is silent in the word black
There is no silent vowel in "not." There is a silent K in "knot."
The silent letter in the word "wrote" is the silent W.
The 't' is silent.
A silent letter is a letter in a word that is not pronounced when the word is spoken. In the word "first," the letter "r" is silent and not pronounced.
The word "island" has a silent "s."
There is no silent letter in that word.