A or an

A or an are used before a noun, or an adjective and noun. The choice depends on the sound at the start of the next word. If it is a consonant sound, use a; if it is a vowel sound, use an. The spelling does not always show this, so try saying them out loud to figure out which to use:

an ant     a kangaroo     an empire     an MGM production     a movie     a historic decision     an honest man     a sandwich     an SS officer     a unicorn     an underpass

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