“A historic…” or “An historic…”?
Should an be used before words beginning with 'h'? What about when the 'h' is silent and is followed by a vowel?
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A rule of thumb is to use "an" only when you do not hear the h when you pronounce the word. See here: "A historic..." or "An historic..."?
We should not when it is not silent. We say "a human" and not "an human".
However, we use 'an' when h is silent. E.g We say 'an hour' but not 'a hour'.