动词是对的,但不需要用过去式,用一般现在时就可以.另外,前面的半句是错的,正确如下：
You should BE careful when you cross the street in the big city.
you should careful when crossed the street in the big cicy
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相关问题
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you must be ____(care)when you cross the street.
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you must be careful when you cross the street中可以用if替代when吗