| convenient store | ?? (??) |
| ???? | She has a part-time job in an convenient store. ?????? ? |
She has a part-time job in a (not an) convenience (not convenient) store. The noun-phrase is not convenient store. " In addition, we traditionally use "AN" when the next word begins with a vowel sound, and we use "A" when the next word begins with a consonant sound.
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