You should BE careful when you cross the street in the big c

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/11/08 00:06:32

You should BE careful when you cross the street in the big city
我把其中的cross改为crossed可以吗 .这个句子好象没有告诉你是现在时还是过去时呀

不可以,因为前面是一般现在时,所以后面就不能是过去时.如果前面说：You should HAVE BEEN careful,那后面就可以用过去时.
时态好像难,其实也简单,你翻译过来想一想：
“你在大城市里过马路时应该小心.”这个意思里完全没有任何时间交代,只是总的来叙述一个意思,适用与任何时间,所以用一般时.

You should BE careful when you cross the street in the big c you should be careful when___(cross) the street in big citie when:you should be careful when _____ the street in big citi 连词成句：cross,be,the,when,careful,you,street You should be careful when you cross the m____ road . Be careful when you cross the street.为什么用cross而不用across? you must be careful when you cross the street中可以用if替代when吗 You must be careful when you cross the street.改为祈使句 be careful when you cross the street,or you may __run over b you must be careful when you cross the street.(同义句) You'd better be careful when you walk ( )[cross] the street. Be careful when you c_______ the street