2.时间状语:recently, lately, since…for…,in the past few years, etc. 3.基本结构:have/has + done 4.否定形式:have/has + not + done. 5.一般疑问句:have或has提前。 6.例句:I've written an article. It has been raining these days. 六、过去完成时 1.概念:以...
用相应的过去的某种时态(一般过去时,过去进行时,过去将来时,过去完成时)。 Michael said that he would try harder the next semester. Jennifer wondered who had taken her umbrella ...
D) has been leaking是现在完成进行时,因此是本题的答案。有11%的考生误选了B) is leaking。由于本句有时间状语for some time,表示谓语动作延续,谓语不能用现在进行时,必须用和完成时有关的时态。有些考生误选了C) leaked或A) had leaked。是因为他们没有注意到本题第...
b) 该做或不该做的事情(语气上接近于should, must, ought to, have to),表示一种命令、规劝性语气。 例:You are to go to bed and keep quiet, kids. Our guests are arriving in less ...
例:We have been working on this project for over a month now. 到目前为止,我们一直在处理那个项目,已经花了一个多月时间了。 5. 一般过去时 (did; was/were) ①表示过去某个时间发...
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