没有错误（I在句首要大写.）冠词用在名词前,帮助说明名词的含义.a,an这类不定冠词仅用在单数可数名词前,所以,不管有没有形容词,只要是单数可数名词前,基本上都用a或an.
what's this?it's an apple. it's a green apple.
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