you should be careful when___(cross) the street in big cities到底是cross还是crossing?

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you should be careful when___(cross) the street in big cities
到底是cross还是crossing?

答案是crossing 确定

crossing
其实是 you are crossing 的省略用法

这个属于时间状语从句，状语从句的省略是这样的：在连词（即这里的when）之后若同时存在主语和系动词，就可以将主语和系动词省略。在这个句子中很明显的，when后面没有主语，即主语you被省略了，那么are也同时被省略了。所以原句应该是
you should be careful when 【you are】 ___(cross) the street in big cities.

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这个属于时间状语从句，状语从句的省略是这样的：在连词（即这里的when）之后若同时存在主语和系动词，就可以将主语和系动词省略。在这个句子中很明显的，when后面没有主语，即主语you被省略了，那么are也同时被省略了。所以原句应该是
you should be careful when 【you are】 ___(cross) the street in big cities.
当你在大城市过马路时一定要小心。
be动词后应该用现在分词，表示主动进行。

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填空: Jim, you should listen to your teacher carefu填空:Jim, you should listen to your teacher carefully (). 英语小作文 关于读书Direction：For this part,you are required to write a composition on the topic：On Reading Books.You should write at least 120 words following the outline given below：1.Books serve different purposes.2.We musr be carefu you should be great You should be mine i should be over you i should be over you you should( ) (not be)careless you should be sorry to i should be over you You Should Be Dancing 歌词 he should be you 歌词 you should be here 翻译 If I should disappear,should you be very sad? You should be more careful next time. Not everyone should be good to you You are my love should not be? You should be ________ careful.怎么填 You should(?)（be）careful.是什么 Not everyone should be good to you.