They will come back（in）two days.为什么不用after?

They will come back（in）two days.为什么不用after? 对括号部分提问：They will come back（in two days）. When will you(return it to)me?In two days.为什么不用give it back或 they will come back in ten minutes这句中为什么不能把in改成after? She said she ___（will）come back in two days my mother will come back (2)1after two days2in teo days He ________(come)back in two days. 英语的句型转换1.He will come back in two days.对in two days划线提问2.Wil My dad will come come back home ( ) two hours.选in或after（说明原因 they will come back in two weeks(对in two weeks提问)用哪个疑问词 -How soom will he come back?- ____ tow days.(before/after/in I'm sure that he will come back in two days