英语高手速来！！急！！！！！！！！！！！！！！

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.

in+一段时间表示将来时
如:I'll come back in a week
in＋一段时间也可用于过去时，意思是”．．．内”
如:he came in two days.
而after＋一段时间通常只能用于过去时，不能用于将来时
如：he came back after a week

at all是根本
after all是毕竟
for all是尽管
in all是总共

用的时候自然知道，这样问没法准确回答

at all是根本
after all是毕竟
for all是尽管
in all是总共
绝对正确！！！！

at all根本 通常和NOT连用,例如:I don't like it at all.另外,NOT AT ALL还可单独使用,来回答THANK YOU 或I AM SORRY.
after all毕竟 例如:DON'T SCOLD HER.AFTER ALL SHE IS A CHILD.
for all尽管 FOR ALLYOU SAY,I STILL LOVE HER.
in all总共 THERE ARE ABOUT 20 STUDENTS FAILED IN THE TEST IN ALL.