Be careful when you cross the street改成用非谓语动词

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Be careful when you cross the street改成用非谓语动词

Be careful when crossing the street.

be careful when crossing the street
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和状语从句的主语一致,状语从句可以略去主语改写为 “连词 + 分词短语”。
本句的 be careful 是祈使句,主语是省略的 you,从句 when you cross the street 中的主语也是 you,所以可以改写如下:
Be careful when crossing the street.

Crossing the street carefully.

Keep careful when you cross the street.