人教版九年级英语全册 Unit 13 We’re trying to save the earth语法小专题习题

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Unit 13 We’re trying to save the earth

单元语法小专题(Grammar Focus)

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一、情态动词用法回顾 needn't.)是的,你们必须今天交.(不,你们不一定要情态动词有can(could)may(might)musthave 今天交.) toshall(should)will(would)dare(dared)need②must是说话人的主观看法,而have to则强调客.情态动词无人称和数的变化;不能单独使用,必须观需要.must只有一般现在时,而have to 有更多的时与其后的动词原形构成谓语. 态形式.如:

1.情态动词的一般用法 I had to work when I was your age.我像你这么(1)cancould 大时,就必须工作了. ①表示能力(体力、知识、技能).can表示现在的能(4)dareneed 力,could表示过去的能力. ①dare作情态动词用时,常用于疑问句、否定句和

②表示请求和允许. 条件从句中,其过去式为dared.如: 此时可与may互换.在疑问句中还可用couldmightHe daren't speak English before such a crowd代替,不是过去式,只是语气更委婉,不能用于肯定句dare he? 他不敢在人群前说英语,是吗? 和答语中.如: ②need 作情态动词用时,常用于疑问句、否定句.

Could I come to see you tomorrow?我明天可在肯定句中一般用musthave toshould代替.如: 以来看你吗? Need I finish the work today?我需要今天完

Yesyou can./NoI'm afraid not.是的,可成这个工作吗? ./不,恐怕不行. Yesyou must./Noyou needn't.是的,必须

③表示客观可能性(客观原因形成的能力). 今天完成./不,不一定要今天完成. 【辨析】canbe able to 【注意】dare need也可作实义动词用,此时有can表示能力时,可与be able to换用;can只有人称、时态和数的变化.在肯定句中,dare后面常接带一般现在时和一般过去时两种时态,而be able toto的不定式.在疑问句和否定句中,dare后面可接带to用于多种时态.如: 或不带to的不定式.need后面只能接带to的不定式.

What else can you see in the sky? What else 如: are you able to see in the sky? 在天空中你还能看He doesn't dare(to) answer.他不敢回答. 见别的什么? He needs to finish his homework today.他今天

They will be able to come back in about twenty 要完成家庭作业. minutes.他们大约能在20分钟后回来. (5)shallshould

(2)maymight ①shall 用于第一人称,征求对方的意见.shall ①表示请求和允许. 用于第二、三人称,表示说话人给对方的命令、警告、might may语气更委婉,而不是过去式.否定回允诺或威胁.如: 答时可用can'tmustn't,表示“不可以,禁止”.What shall we do this evening? 今天晚上我们用“May I…?”征询对方许可时比较正式和客气,而做什么? 用“Can I…?”在口语中更常见. You shall fail if you don't work hard.如果你

②用于祈使句,表示祝愿.如: 不努力就会失败.(警告) May you succeed!愿你成功! ②should意为“应该”,通常表示劝告、建议等.(3)musthave to 如: ①表示必须、必要. I should help her because she is in trouble.在回答由must引出的问句时,如果是否定的,不我应该帮她,因为她陷入麻烦了. 能用mustn't(禁止,不准)而用needn'tdon't have You should go to class right away.你应该马上to(不必).如: 去上课.

Must we hand in our exercise books today? Should I open the window? 我应该打开门吗? 们今天必须交练习本吗? (6)willwould

Yesyou must.(Noyou don't have to/you ①表示请求、建议等,would更委婉.如:

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Will/Would you pass me the ballplease? 能把那个球递给我吗?

②表示意志、愿望和决心.如:

I will never do that again.我再不会那样做了. ③would表示过去反复发生的动作或某种倾向.如: During the vacationhe would visit me every other day.假期里,他每隔一天看我一次.

2.情态动词表推测

(1)can表示推测(惊讶、怀疑、不相信的态度),通常用于疑问句、否定句中.如:

Can this be true?这可能是真的吗?

This can't be done by him.这不可能是他做的. (2)may/might().might不是过去式,它所表示的可能性比may.如:

Your mother may/might not know the truth.妈妈可能不知道真相.

(3)must表示可能性极大的主观推测,只用于肯定的陈述句中.如:

You're Tom's good friendso you must know what he likes best.你是汤姆的好朋友,你一定知道他最喜欢什么.

He must be home by now.他现在一定回家了.

二、used to用法回顾

1used to后接动词原形,表示过去经常性或持续

性的动作或状态,意为“过去常常”.如:

My mother used to go shopping on weekends.母亲过去常在周末购物.

When I was youngit used to be very cold in winter.我小的时候,冬天经常很冷.

2used to的否定形式为“didn't use to do sth.”或“usedn't to do sth.”;一般疑问形式为“Used+主语+to do sth.”或“Did+主语+use to do sth.”;附加疑问句式为“usedn't+主语”或“didn't+主语”.如:

I didn't use to like singing./I used not to like singing.我过去不喜欢唱歌.

Did you use to play football/Used you to play football? 你过去常常踢足球吗?

【拓展】(1)be/get used to(doing) sth.表示“习惯于()某事”,其中to为介词.如:

He is used to living in the city.他习惯于住在城市.

(2)be used to do/for doing sth.表示“被用于做某事”,其中的be used是被动语态结构.如:

Wood can be used to make/for making furniture.

木材可用于制造家具.

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Ⅰ.canmaymustneedhave to的适当形10If the traffic light is redyou mustn't 式填空. cross the road.It's dangerous.

1You must return the book to the library on Ⅱ.用括号内所给单词的适当形式填空. time. 11We don't need to__work(work) today.

2I can't(not)find the way to the 12He doesn't dare to__break(break) his hospital.Could you show me the way? promise.

3.—Must I finish the work right now? 13Some students are used to asking(ask) their Noyou needn't(not)You may do it later. parents for help when they meet trouble. 4He said he couldn't(not) come tonight. 14There used to__be(be) a quiet village here. 5Her mother was ill.She had__to stay at home 15I think you will be used to living(live) and look after her. in the countryside.

6It's time for class.You must stop playing 16All of us know that cotton can be used football or you may be late for class. to__make(make) cloth.

7The cloud is liftingso it can't(not) be 17You used to__go(go) to school by bikea rainy day tomorrow. didn't you?

8The desk is not dirty. You needn't clean it. Ⅲ.根据汉语意思完成句子,每空一词. 9What is your mother going to do this 18.这本书一定是汤姆的,他的名字在封面上. Saturday? This book must be Tom's. His name is on the

I'm not sure. She may/might go to see my cover. grandmother. 19.他被一个5岁的小男孩愚弄了,这可能是真的

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吗?

Can it be true that he was fooled by a fiveyearold boy?

20.你的车需要维修了.

Your car needs repairing. 21.这种小刀是用来切东西的.

This kind of knife is used to cut things. 22.当我年轻的时候,我常常打篮球.

I used to play basketball when I was young. 23.他过去常花很多时间玩电脑游戏吗? Did he use to spend much time playing computer games?

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