They will come back（in）two days.为什么不用after?（In）about three days.（回答）为什么用in?我记得有一个回答好像用for的,什么时候用for啊?

They （not come）back yet.I think they will comThey （not come）back yet.I think they will come back in an hour. they will come back after comes here的同意句 They will come back any minutes 还是in any minutes? It will not be long keore they come back. 英语找错They will come back until tomorrow. I WILL COME BACK 对in two weeks提问应该用when还是how long例如:They will come back in two weeks.提问应该是非功过How long will they come back?还是when will they come back? NBA2K12 They come back 歌词 When will she come back? When will she come back you will come back,right? When he will come back They will come back from ___ today ___tomorrowA either orB neither nor They will come back tomorrow.tomorrow被划线 对划线部分提问 they will come back after the teacher comes here的同意句 对括号部分提问：They will come back（in two days）. they will come back ( ) ten minutes.A.in B.after C./ D.during they will come back in ten minutes这句中为什么不能把in改成after?