Use 'a': horse, mechanic , house, Ukelele , union, hurricane , yak, hexagon , quilt, unicorn, honey pot, utility , Use 'an': elephant , X-ray, honorary degree, ostrich , oval, elevator , uncle, onion, apple, honest (noun = man, child), app, icicle, Neither 'a' or 'an' used (sometimes 'the'): AIDS (diseases), malaria (diseases), sand (not countable), electricity (not countable), politics (ideas), math (ideas), art (ideas), grass (not countable), 2 dogs (already numbered), 3 gifts (already numbered), Eiffel Tower (specific place), Disneyland (specific place),

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