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Australian manual of scientific style Start communicating effectively
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