in 和 after的用法:
a)"in+段时间"常用于含将来概念的句子中,意思是"在多长时间以后"或"在多长时间内"; "after+段时间"常用于过去时的句子中,表示"在多长时间以后"。比较:
He will come back in ten days.他将在十天后回来.
He said he would come back in ten days.他说他将在10天后回来.
He came back after ten days.他10天后回来了.
The old man left home in 1924 and came home after thirty years.那老人1924年离开家.30年后才回来.
b)"in+段时间"也可用于过去时,意思是"在……内".如:
He wrote the book in two and a hallf years.他是在两年半的时间里写完这本书的.
He finished drawing a beautiful horse in five minutes.他五分钟内就画好了一匹漂亮的马.
注意:如果after后接的不是段时间,而是点时间,则可用于将来时,如:
My brother will go there after four o'clock.偶兄弟四点钟后去那儿.
He will leave after New Year's Day.过了元旦他就要走.
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