when crossing street,you must be careful

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/13 02:42:39

when crossing street,you must be careful
这句话,前后主语相同,前面的when是不是也要省啊

可以省略
但现在分词词作作时间和条件状语时,前面常加when/ while/ if/ even if/ unless等,使条件或时间状语一目了然.
楼上的回答值得商榷!
再问： j介意再来一题吗 look over there，there is a very long ,winding path --- 看那儿，有一条既长又蜿蜒的小路，向上通向那个房子后面可不可以是to
再答： to/ towards 可以呀！
再问：答案是leading up怎么解释，是在句中做什么成分
再答：是leading up to吧？等于to/towards
再问：对，是在句中做什么成分呢？还有那个only to后可以接哪几种结构啊
再答：后置定语

when crossing street,you must be careful You must be careful when crossing the street.改为祈使句 Be careful when you are crossing the street. Be careful when ( you are ) crossing the street. be careful when you are crossing the street.可以改写成be careful you must be careful when you （）the street 英语状语从句1.when crossing the street,you should be careful.所示是什么 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 you must be careful when you cross the street.(同义句) Be careful when you c_______ the street _be careful when crossing the street.