The words 'a' and 'an' are indefinite articles ('the' is a definite article) that precede a singular, general word. The article 'a' precedes a word that begins with a consonant sound; the article 'an' precedes a word the begins with a vowel sound. Example sentence:
I have both an old and a new car.
i do not know how to use embalming in a sentence. (there is the sentence)
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
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Use it in a big sentence.
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