cross可以作动词 “v.越过,渡过,横穿,横渡;”
across作介词或副词 “adv.横过,另一边,
prep.横越,穿过; 在...那边#横过,另一边,”
因此句子中cross可以直接作谓语,而across则需要在前面加动词如walk,组成词组.
Be careful when you cross the street.为什么用cross而不用across?
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