help1.We must have the books before SeptemberA.print B.to print C.printing.D.printed(这里到底是完成时还是have是使役动词,怎么区分)2.When I passed by the station,I saw the accident A.happened B.happening C.happen(选C.为什么

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help1.We must have the books __before SeptemberA.print B.to print C.printing.D.printed(这里到底是完成时还是have是使役动词,怎么区分)2.When I passed by the station,I saw the accident __A.happened B.happening C.happen(选C.为什么
help
1.We must have the books __before September
A.print B.to print C.printing.D.printed
(这里到底是完成时还是have是使役动词,怎么区分)
2.When I passed by the station,I saw the accident __
A.happened B.happening C.happen
(选C.为什么不选B,不是正在做的事情吗?)
3.Mike had nothing for breakfast,___?
A.does he B.did he C.didn't he D.had he
(当have(had,has)不做"有"解释时,不应该用do(does,did)引导吗?为什么选B?

help1.We must have the books __before SeptemberA.print B.to print C.printing.D.printed(这里到底是完成时还是have是使役动词,怎么区分)2.When I passed by the station,I saw the accident __A.happened B.happening C.happen(选C.为什么
1.D.
have sth done.使某事被（别人）完成.have the books printed,把这些书拿去打印了.
2.C.
see sth happen.看见某件事发生了.发生过.
see sth happening.看见某事正在发生.
这个题,主要强调,在路过车站的时候,我看见发生了一场事故.事故发生是一个短暂性的动作,不具有延续性,所以要用see sth happen.看见某件事发生了.发生过.
3.B.
句意：麦克没有吃早饭,是吗?
句子前一部分是had nothing for breafast,是否定句意,所以句子后一部分的反问要用肯定形式.而had是have的过去式,所以反问要用do的过去式did.
希望可以帮助你理解!

1 D（使役动词，固定用法have sth . done '叫某人做某事'；现在完成时的结构：HAVE DONE 一般不分开的)
2 B（经过车站的时候看见事故正在发生，SEE …DOING ‘指动作正在发生’，而SEE …DO ‘指动词已结束’）
3 因为HAD 在这是实义动词‘ 有’，故要加助动词DID...

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1 D（使役动词，固定用法have sth . done '叫某人做某事'；现在完成时的结构：HAVE DONE 一般不分开的)
2 B（经过车站的时候看见事故正在发生，SEE …DOING ‘指动作正在发生’，而SEE …DO ‘指动词已结束’）
3 因为HAD 在这是实义动词‘ 有’，故要加助动词DID

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1.使役动词看对现在又没有影响有影响的是完成时
2.当这个人说这句话是事情已完成了，或者理解为看到了整个过程
3.had 在这里是过去式

1.D 完成时态have后面要接动词的过去分词形式，而这里是名词，显然是have sth. done的结构
2.C 只是陈述过去的一件事情，我看到了车祸发生，并不强调正在发生。
3.B have是吃的意思，是一般动词，所以仍然用do来引导。只有have作非实义动词引导完成时态时才用have引导。...

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1.D 完成时态have后面要接动词的过去分词形式，而这里是名词，显然是have sth. done的结构
2.C 只是陈述过去的一件事情，我看到了车祸发生，并不强调正在发生。
3.B have是吃的意思，是一般动词，所以仍然用do来引导。只有have作非实义动词引导完成时态时才用have引导。

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D have sth. done
C happen 是不及物动词
B have 是实意动词，

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第一题
have应该是使役动词 have sth done 选D
请某人做某事
如果说是完成时，结构应该为have done （中间不会有sth的）
而和情态动词must有关的完成时应该为must have done 和本题不符
第二题
选C的原因是 happen 是一个瞬间性的动词如果选B就是强调动作选C强调过程
这个事故是瞬间发生的你是看到了全过程的所以选C
举个例子吧
I saw a girl falling/fall into the river.
掉下去也是一瞬间的事你看到了全过程的额不可能只看到某个片段好好体会
第三题
选B have（had）这边不是助动词而是一个实意动词这里可以解释为 “有”
当have作为实意动词时反义疑问句就应该用do（not）引导（注意时态人称变化）
当have作为助动词时就应该用have（not）引导（注意时态人称变化）

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1.We must have the books __before September
A.print B.to print C.printing. D.printed
(这里到底是完成时还是have是使役动词,怎么区分)
答：我选D！大意是：我们必须在9月份之前把这些书印出来。
这里当然不是完成时，如果是完成时的话，have就直接加动词的过去分词了，中间只会出现一些副词，不会有名词、代词之类的单词出现的！
2.When I passed by the station,I saw the accident __
A.happened B.happening C.happen
(选C.为什么不选B,不是正在做的事情吗?)
答:你要想想事故发生是瞬时性的动词不会延续，不可能是正在发生，也就是说不能用ing形式了！
3.Mike had nothing for breakfast,___?
A.does he B.did he C.didn't he D.had he
(当have(had,has)不做"有"解释时,不应该用do(does,did)引导吗?为什么选B?
答：选B是完全正确的！
原因如下：
1.have作动词的时候不管是什么意思，翻译疑问句都要使用助动词！have+动词的时候，have在这里就不是动词了而是表示完成时的一个标志，后面那个才是正真的动词，反义疑问的时候就要用have了！
2.前半句有否定词nothing，所以翻译疑问句要用肯定！

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help1.We must have the books __before SeptemberA.print B.to print C.printing.D.printed(这里到底是完成时还是have是使役动词,怎么区分)2.When I passed by the station,I saw the accident __A.happened B.happening C.happen(选C.为什么 We must value what we have We have learned many important physics ( t )and wo must learn them by heart. 用所给词的适当形式填空 start；have；exercise; take; get; want; try; play; help1.The trees are too high.We can't .the apples on them.2.---How often do you .---Every day.3.Let's .our new lesson.4.Don't .with fire.It's dangerous.5.My teache We --- the letter yesterday,but it didn't arrive A .ought to receive B .ought to have received C.must have received D.must receive We must have been drunk last night,_____?A.weren't we B.mustn't we C.hadn't we D.didn't we老师说选D 但为什么不选A啊? we must have missed you along the What must we have to keep healthy? in stuying we must have patience [请教]高二英语单选题1.She_____the book sometime in the past,or she ____the question so well.A.must have read; couldn't have answeredB.must read; couldn't have answeredC.must have read; couldn't answerD.must have read; can't answer2.We are go We must have been drunk last might,_________?A 为什么不对啊A.weren't we B.mustn't we C.hadn't we D.didn't weA 为什么不对啊 We didn't know his telephone number, otherwise we ___ him.A. would have telephonedB. would telephoneC. must have telephonedD. had telephoned I don't believe we have met before,.I must say do look familiar.为啥用although不用therefore — We must go to a dance soon, or we will forget how to dance.— _______________A___________________.A. Yes, we must. B. No, we needn’t.C. Yes, we have to. D. Maybe, we must.请高手讲下,用must提问,回答的时候不是 Must we come to school at 7:00? No, you__________.A. mustn't B.can't C. may not D.don't have to 选择什么?为什么? must we go out right now?回答是:no, you____A mustn't B shouldn't C may you D don't have to [ ] must we finish the exercise today no ,you { }A mustn'tB don't haveC don't have toD needn't to并说明原因 You ________ all those calculations!We have a computer to do that sort of thing.A) needn’t have doneB) must not have doneC) shouldn’t have doneD) can not have clone