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You use a. Use an only with words that start with a vowel sound.

A word that starts with s cannot start with a vowel sound, unless the s is actually pronounced like the name of the letter, which is not common. For example, you would say an S-hook, because that would be pronounced an ess-hook. However, for "normal" words that start with s, the article a is correct, as in a serious problem or a sock.

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13y ago

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