1.in,after,later 都含有“在……以后”的意思,但它们在用法上有区别.初学者往往对其用法感到迷惑.A.in作介词,用来表示从现在算起的“过一段时间以后”,常用在将来时的肯定句里,一般与go,come,start,arrive,return (be back),finish等表示瞬间动作的终止性动词连用.如：They will arrive in half an hour.半小时后他们将到达.He will leave in a minute.他一会儿就走.B.after其后既可接时间点,又可接时间段.He left there after two o'clock that afternoon．那天下午两点以后,他离开了那儿.
He started to go again after two days．两天以后,他又走了.但是,如果after用于一般将来时,那么其后应接时间点.如：He'll come here after three o'clock．他三点钟后将来这儿.来源：( http://blog.sina.com.cn/s/blog_53ca7b1b0100fdlq.html) - in,after,later的用法区别_岸江_新浪博客 He will arrive after five o’clock.他 5 点钟以后到.总之,两者均可与一段时间连用,表示“在…之后”,但是：after 表示以过去时间为起点的一段时间以后,因此通常与过去时连用；after 除与时间段连用外,还可与时间点连用,此时则可用于将来时(但是in不能与时间点连用)：而 in 则表示从现在算起的一段时间以后,因此通常用于将来时或含有将来意义的句子.如：He came back after three days.3天后他回来了.I’ll come back in three days.我3天后回来.C.later作副词,可以指过去,也可指将来,常常放在时间段的名词之后.如：Three days later he got to Beijing．＝After three days he got to Beijing．他三天以后到达了北京.At first she was asleep.Half an hour later/After half an hour she woke up.开始她睡着了,半小时后醒来了.The radio says that the sun will come out later.收音机里说太阳稍后会出来.【显身手小练】 用in,after或later填空.1.I shall go swimming ______ four o'clock this afternoon.2.They will return _________ two weeks.3.We shall come again _________.4.The meeting ended _________ an hour.5.He is going to London _________ three days.6.We started out ______ two weeks.A.in B.after C.later D.for7.Just____seven the rain began to fall.8.He went there a few days______.9.She will come to see us ________ .10.I shall come round _________a day oｒ two.11.He then left home,and came back______ a year.参考答案：1.after 2.in 3.later 4.after 5.in6.B 7.after 8.later 9.later 10.in 11.afte