BEFORE DOING和AFTER

BEFORE DOING和AFTER before doing和before to do after和before的用法 are we doing a before and after piece 关于after和before的疑问?after是一个介词,有说after doing的,那么有没有说before doing的?比如这个,after finishing my homework,i am going to bed.可不可以说,i can not go to bed,before finishing my homework 能不能在给我 before doing sth 和 before you do sth,为什么? after的运用和before的运用 Before和after各是什么意思啊? before和after分别什么意思. before和after一定要用过去式吗? after did sth.和after doing sth.有什么区别? are we doing a before and after piece I don't know about 中的before and after piece 这句话来自The devil wears Prada before和ago的区别,later和after的区别 在句子中before和after前后都是什么时态 before和after造两个句子顺便翻译 before 和after 在句里面 看主句从句 after some time和before long的区别 The month is after August和The month is before