2019春九年级英语下册Module4Rulesandsuggestions模块语法专练课件(新版)外研版.pptx

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1、模 块 语 法 专 练,情态动词 1.概念: 情态动词表示说话人对某一动作或状态的态度,或表示主观设想。情态动词本身有词义,无人称和数的变化( have to除外 )。情态动词不能单独作谓语,必须接实义动词或系动词原形构成谓语。 2.常见情态动词的用法: ( 1 )can的用法。 表示具有某种能力,意为“能;会”。 表示可能性,意为“可能”。 表示许可,意为“可以”。在口语中常代替may。 can只能用在一般现在时和一般过去时中。can的过去式是could。 注意:在口语中,could常代替can来向对方委婉地提出请求或表示看法,这时could不表示过去时态。,( 2 )may的用法。 用来征

2、求对方意见,意为“允许;可以”。此时,因为口语性比较强,所以答语较灵活,但要根据实际情况作答。 表示说话人的猜测和对可能性的判断,意为“可能;也许”。 ( 3 )must的用法。 表示说话人的主观意志,意为“必须;应当”,其否定回答通常用neednt或dont have to,意为“不必”。 must本身的否定形式must not/mustnt意为“不许( 做某事 );一定不要”,表示禁止和告诫。 must表示对事物的推测,意为“想必;一定”,只用于肯定句中。表示推测时,must的语气比may要强得多。表示有把握的否定判断时用cannot/cant,意为“不可能”。,( 4 )need的用法。

3、 need用作情态动词时,它没有人称、数和时态的变化,一般只用于疑问句或否定句中,其后接动词原形。其否定式是neednt,疑问句将need提到句首。 注意:在need引起的一般疑问句中,肯定回答用must,否定回答用neednt。 ( 5 )shall/should的用法。 shall 作情态动词常用于一般疑问句,与第一人称连用表示征求意见。should 作情态动词,表示劝告或建议,意为“应该”。例如: You should go for help.你应该寻求帮助。 ( 6 )will的用法。 will表示有做某事的意志、意愿或打算。,( 7 )would 的用法。 would用于提出提议或邀

4、请或提出客气的要求或请求。“Would you mind doing.”句型通常用于表示请求对方做一件有一定麻烦的事情,语气一般都非常客气。注意回答时表示介意,应用“Yes,I do./Of course.”等;表示不介意,应用“No,I dont./Of course not.”等。 ( 8 )had better的用法。 had better意为“最好;应该”,后面接动词原形。否定形式在better后加not。,.单项填空 ( C )1.Students in our school know shouting is not allowed in the library. A.can B.m

5、ay C.must D.will ( B )2.You drive your car so fast.Its very dangerous. A.wouldnt B.shouldnt C.couldnt D.mightnt ( A )3. I see your ID card,sir?We have to check your information. A.May B.Must C.Should D.Need,( C )4.Where are you going this month? We go to Xiamen,but were not sure. A.neednt B.must C.m

6、ight D.mustnt ( D )5.Its rather hot in the room.Youd better the windows or the door. A.close B.not to close C.dont close D.not close,.用方框中的情态动词填空,每个单词只能用一次,can,may,cant,mustnt,should,1.Dont you see the sign “Silence”?You mustnt talk. 2.It is noisy.I cant hear you. 3.You may use the computer if you like. 4.Lucys parents are proud of her.She can speak four languages. 5.You should pay him for the newspaper.,

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