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英语完成时问题where____John_____?To the library .He___there for an

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英语完成时问题
where____John_____?To the library .He___there for an hour.
答案是has.been.has gone
为什么第一个是has..been第二个是has gone
在完成时中什么时候可以用短暂性动词?什么时候要把短暂性动词变为延续性动词?完成时疑问句中一定要用延续性动词吗?
那个还有，完成时有什么标志性的单词？yet是么？还有already?
英语完成时问题where____John_____?To the library .He___there for an
has been to 是指曾经去过某地,去了回来过,而has gone是指去某地没回来,还在那里.
完成时标志性单词有好多,那两个都是.还有ever for just never recently 一些词.
要理解必须多做题,自己去理解,做题多了就会了.
关于英语非谓语的问题These books must be returned to the library after 选词：Mary went to the library to/for her book. You should return all the books ---------to/for the library 英语小作文:The rules for the library.不要照片 It takes me an hour to go to the library by bike 翻译 it takes me an hour to go to the library by bus. It is time for you to return the book to the library 同义句 英语题目1. It is ______ for an ordinary plane to fly to the moon 翻译：The library has to pay less for the work of the robots. 英语改病句 The film has begun for half an hour when I got to the 根据首字母完成单词 he goes to the library three times a week,so you c they are going to r____money to build a library for the hope