《2017_2018学年高中英语unit2healthyeatingsectionⅲ课件新人教版必修3》由会员分享，可在线阅读，更多相关《2017_2018学年高中英语unit2healthyeatingsectionⅲ课件新人教版必修3（24页珍藏版）》请在金锄头文库上搜索。
1、Section Grammar,一,二,三,一、请用下列情态动词造句 1.ought to/oughtnt to 2.should/shouldnt 3.mustnt 4.neednt 5.dont have to 6.will 7.can/cant 答案:略,一,二,三,二、用ought to,need,mustnt完成句子 1.你不应当在外面待到这么晚。 You stay out so late. 2.你一定不要玩刀。 You play with the knife. 3.他们需要立刻打扫房间吗? they clean the room at once?,oughtnt to,mustnt
2、,Need,一,二,三,三、请把下列短语和其汉语意思搭配起来 1.lose weight A.失去兴趣 2.lose interest B.丢脸;没有面子 3.lose heart C.减肥 4.lose face D.失去信心,语法图解,Grammar 情态动词:ought to/ought not to/have to/dont have to/mustnt/neednt以及情态动词完成式的用法。 1.ought to (1)ought to无人称和时态的变化,其否定式为ought not to/oughtnt to,疑问式为:Ought I/you/he to.?常译作“应该,应当”。语
3、气比should稍重一些,表示有责任、义务等。 单句填空 Im his teacher.I ought (take) care of him. 答案:to take They are having a class.You make such noise here. 答案:oughtnt to Ought I write to say thank you? Yes,you ought (to). 答案:to,(2)含有ought to的反义疑问句,陈述部分是肯定时,疑问部分用shouldnt/oughtnt+主语。 单句填空 He ought to know what to do, he? 答案
4、:oughtnt/shouldnt (3)表示推测,多指按照常理的一种推测,意为“按理应该”。 翻译句子 It is already 9 oclock;he ought to be in his office now. 翻译 答案:已经九点了,他现在应该在办公室里。,2.have to通常指由于客观原因而不得不做某事,意思为“不得不,必须”。 【高考典句】(2016全国高考) One morning,I had to book an immediate flight home for a family emergency. 一天早上,因为一件家庭急事我不得不预定一趟立刻回家的航班。 注意:ha
5、ve to与一般情态动词的不同点,(1)一般情态动词没有人称和数的变化,而且所用的时态也受到一定的限制,而have to有人称和数的变化,可用于多种时态中。 He has to admit the idea of marriage scares him. (用于 人称 数 时态) 答案:第三;单;现在 We will have to put off the sports meeting because of the bad weather. (用于 人称 数 时态) 答案:第一;复;将来 They had had to consider it carefully before they len
6、t him the money. (用于 人称 数 时态) 答案:第三;复;过去完成,(2)否定句和疑问句的构成方式不同 have to的否定句和疑问句的构成需要借助于助动词do的适当形式或助动词will,而不可以在have后面加not。 根据汉语意思用have to的适当形式完成句子 你没必要那么早去会议室,还有30分钟。 You head for the meeting room so early.There are 30 minutes left. 答案:dont have to 她必须按照你告诉她的来做此事吗? do it as you told her? 答案:Does she ha
7、ve to 他不得不做一份兼职工作来付学费,是吗? He has to do a part-time job for his schooling, ? 答案:doesnt he,3.mustnt (1)must的否定式must not/mustnt,表示“不允许”或“禁止”。 翻译句子 You mustnt tell him the news. 翻译 答案:你一定不要把此消息告诉他。 The magazines mustnt be taken out of the reading room. 翻译 答案:不许把这些杂志拿出阅览室。 (2)在否定回答“May I.?”这样的问句时,常用mustn
8、t表示“禁止”“不允许”。 单句填空 May I park here? No,you . 答案:mustnt,4.neednt (1)neednt表示“不必”。neednt的同义结构是dont have to。 同义句转换 You neednt drive so fast. =You drive so fast. 你不必开这么快。 答案:dont have to (2)否定回答must问句时,用neednt或dont have to,表示“不必”。 单句填空 Must we hand our homework in after class? No,you . 答案:neednt,5.“情态动词
9、+have done”用法归纳 (1)must have done 在肯定句中,must have done表示对过去发生过的情况肯定性的判断、推测,语气最强。 完成句子 你怎么又迟到了?你一定是睡过头了。 How can you be late again?You . 答案:must have overslept,(2)may/might have done may/might have done主要用于肯定句,也可用于否定句,但不用于疑问句,语气比must have done弱,意思为“可能”。 翻译句子 He may have missed the train. 翻译 答案:他可能没赶上
10、火车。 If you had studied hard,you might have passed the exam. 翻译 答案:如果你努力学习的话,你可能会及格的。,(3)can have done can have done主要用于否定句和疑问句,很少用于肯定句。 翻译句子 Where is Jack?Where can he have gone? 翻译 答案:杰克在哪里?他可能去哪儿了? (4)could have done could have done可以用于各种句型,即肯定句、否定句、疑问句。 翻译句子 We could have arrived there before dar
11、k,but we didnt. 翻译 答案:天黑前我们本来能够到那里的,但是没到。,(5)cant/couldnt/mightnt have done 对已发生事情没有把握的推断,意为“不可能或可能不”。 完成句子 他不可能去了纽约,我刚才在阅览室见到他了。 He to New York.I met him in the reading room just now. 答案:couldnt have gone (6)should have done should have done表示过去本应该做,但实际上没做。 翻译句子 You should have told me earlier or I
12、 might have gone with them. 翻译 答案:你应该早点告诉我,不然的话我就会和他们一块去了。,(7)shouldnt have done shouldnt have done在形式上是否定,但表达的是肯定的意思,即表示过去本不应该做,而实际上做了。 单句填空 You blamed her in public. 答案:shouldnt have (8)ought to have done ought to have done在含义上相当于should have done,但语气更重一些。 翻译句子 As her best friend,I ought to have vi
13、sited her last week.But I was too busy. 翻译 答案:作为她最好的朋友,我上周本应该去看她的,但我太忙了。,(9)oughtnt to have done oughtnt to have done在含义上相当于shouldnt have done,但语气更重一些。 单句填空 You have spent so much time playing computer games. 答案:oughtnt to (10)neednt have done neednt have done表示过去本没有必要做,但实际上做了。 翻译句子 Its so near!We n
14、eednt have taken a taxi. 翻译 答案:这么近!我们本来没有必要坐出租车的。,一、选择适当的情态动词填空:ought to,have to,mustnt,neednt,need 1.You can make your own decision and dont get permission from him. 答案:have to 2.We protect the earth where we live. 答案:ought to 3.Alice,you play with fire.Its dangerous. 答案:mustnt 4.You help me do it.
15、I can manage it myself.Thank you all the same. 答案:neednt,二、完成句子 1.你不必五点起床。 You at five. 答案:neednt get up 2.我们应该参军保卫我们的祖国。 We the army to defend our motherland. 答案:ought to join 3.为了赡养他的家庭,每年他不得不去广州打工。 To support his family,he go to work in Guangzhou. 答案:has to 4.你一定不要把陌生人带到你的家里。 You strangers to your home. 答案:mustnt take 5.昨天,你本不应该向我撒谎。 You a lie to me yesterday. 答案:oughtnt to have told,
