after / in 的区别用法
问题描述：
after / in 的区别用法
答
after 用过去时
IN 用将来时
答
in + 时间:用将来时
after + 时间:用过去时
答
in +时间段：与将来时连用
after +时间段：与过去时连用
after +时间点：可与将来时连用
He will be back in two hours.
He came back after two hours.
He will be back after two o'clock.