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have done before
have
+过去分词 和
had
+过去分词 有什么区别
答:
1、表示的时态有区别
have
+过去分词是现在完成时;而
had
+过去分词表示的是过去完成时 2、两者的用法不同 现在完成时have+过去分词表示动作发生在过去,侧重于对现在产生的结果或造成的影响,与现在有关。例句: I have finished my homework.我已经做完作业了 过去完成时had +过去分词则是一个相对的...
have
you
done
this kind of work
before
答:
嗯 我也觉得可以用haven't you?
could
have
done
与could do区别
答:
could
have
是表示推测 talk about possibilities in the past 或者是能力,这种能力表示针对单件具体的事情的能力, 并且是推测中的能力,并没有真实发生。i could swim,过去发生的 反复发生的能力 i could have
done
this
before
. 推测的能力,针对具体的某件事情的能力。说到 could 在描述过去的...
have
you never
done
this
before
答:
你以前做过么?额,我没有做过,但是我有我认识的人做过.(BTW,这种对话怎么感觉像是Nikita里面的= =语气好熟悉的感觉.)
...2.现在进行时:be doing 3.现在完成时:
have
done
4.现在完成...
答:
3. 现在完成时:
have
done
4. 现在完成进行时:have been doing 5. 一般过去时:done 6. 过去完成时:
had
done 7. 过去将来时:would/ should do 8. 过去进行时:was/ were doing 9. 一般将来时:shall/will do 10. 将来进行时:will be doing 11. 将来完成时:will have done 12.将来完成进行...
might
have
done
是什么意思?怎么用?
答:
might
have
done
(对过去的猜测)可能、究竟、到底(已经)……,也许已经做了某事(语气比较委婉,可能性不如may have done大);也表示本来应该(能够、可以)做某事而实际上没有做(表示虚拟语气)。例句:The only dark cloud on the horizon was that they might have to move house.唯一的忧虑...
before
是什么意思
答:
before
的意思是之前。一、发音英:[bɪˈfɔː(r)];美:[bɪˈfɔːr]二、中文翻译prep.之前;在...以前;在...面前(或前面);(次序或排列)在前面;当面 conj.在...以前;到...为止;到...之前;以免;不然;(宁可...而)不愿 adv....
英语语法:被动语态的用法
答:
The classroom hadn’t been cleaned
before
the teacher came. 在老师来之前,教室尚未打扫。The tickets
had
been sold out before I came to the cinema.在门票被销售一空前我赶到了电*。8.将来完成时的被动语态构成:shall/will +
have
done
They will have been married for 20 years by ...
英语八大时态
答:
2.时间状语:
before
, by the end of last year(term, month…),by the time...,etc.3.基本结构:
had
+
done
.4.否定形式:had + not + done.5.一般疑问句:had放于句首。6.例句:As soon as we got to the station, the train had left.By the end of last month. We had ...
before
和after since的用法
答:
since与after 都可以用来引导表示从过去某一点开始的时间段词组。它们的不同之处在于:a)since引导的词组所表示的时间一直延续到说话时为止,因而要与现在完成时连用。例如:He
has
been there twice since 1982.I
have
done
nothing since six o’clock.b)after引导的词组所表示的时间是纯系过去,...
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