2019年外研版英语必修4学案:Module 5 Section Ⅲ 复习情态动词
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1、Section_ Grammar_复习情态动词语法图解探究发现They could go anywhere they wished.We could see the sun setting behind the white pagoda.We shouldnt waste a drop of water.It may be true.He might have a fever.Since it is raining, we have to stay indoors.We must learn English well.Must you listen to the loud music at n
2、ight?我的发现(1)句中情态动词表示“有能力做某事”。(2)句中,情态动词表示“不应该( 做某事)”。(3)句中情态动词表示“推测”。(4)句中,黑体部分均表示“必须”,但 must 多表示主观意志,而 have_to 多强调客观上的需要。(5)句中 must 意为“偏要,硬要”,常常表示质问或不耐烦。情态动词表示说话人对某一动作或状态的态度,本身不能单独作谓语,必须和不带 to的不定式( 即动词原形)连用。情态动词没有人称和数的变化。1can 和 could (could 是 can 的过去式,语气更委婉)(1)表示能力。He can use the computer skillfull
3、y now, but he couldnt last year.他现在能熟练使用电脑了,但去年他不会。(2)表示可能性(肯定句中表示 “一时的可能性”), 可译为“有可能;有时会”。Training by oneself in a gym can be highly dangerous.一个人在体育馆训练有时会很危险的。(3)表示许可。Can/Could I have a look at your new pen?Yes, you can./No, you cant.我可以看一看你的新钢笔吗?可以。/不可以。名师点津 can 表示允许时,在疑问句中用 could 更委婉,在回答中一律用 can
4、。(4)can/could 在否定句、疑问句中表示推测或怀疑,译为 “可能”。That cant be Mary shes in hospital.那不可能是玛丽她在住院。Someone is knocking at the door. Who can it be?有人在敲门,可能是谁呢?(5)cant 与 enough 或 too 连用,表示“再也不为过”。You cant be careful enough.你再细心也不为过。(6)can 与 be able to 的区别。can 表示“能力”时,只有 can 与 could 两种形式,仅表示具备的能力,不说明是否实施了努力。be able
5、 to 表示 “能力”时,可以用于各种时态, be able to 用于过去时态表能力时,侧重指经过努力而成功做到某事。The fire spread through the hotel very quickly, but everyone was able to get out.大火在整个宾馆内蔓延开来,但每个人都成功逃出来了。即时演练 1选词填空:can, could, couldnt, be able to(2017北京高考改编)Samuel, the tallest boy in our class, can easily reach the books on the top shel
6、f.(2016天津高考改编)It was really annoying; I couldnt get access to the data bank you had recommended.(2015浙江高考改编)It was so noisy that we couldnt hear ourselves speak.(2014北京高考改编)Can I have a word with you? It wont take long.I was_able _to swim to the bank after the boat turned over.2may 和 might(1)表示允许或征询
7、对方许可,might 表示更加委婉的语气。(有时可与 can/could 互换)May I watch TV after supper?Yes, you may./No, you mustnt.晚饭后我可以看电视吗?是的,可以。/不可以。否定回答时,用 cant 或 mustnt,不用 couldnt。(2)表示可能性,might 可能性更小。They might be having a meeting, but Im not sure.他们有可能在开会,不过我不确定。(3)may 放在句首可以表示祝愿。May God bless you!愿上帝保佑你!(4)may/might as well
8、动词原形,意为“不妨”。If that is the case, you might as well try.如果事情是这样的,你不妨一试。即时演练 2 用适当的情态动词填空(2015陕西高考改编)You may feel all the training a waste of time, but Im a hundred percent sure later youll be grateful you did it.(2015江西高考改编)Life is unpredictable; even the poorest might become the richest.Are you comi
9、ng to Jeffs party? Im not sure. I might go to the concert instead.May I smoke in this room?No, you mustnt.3must 与 have to(1)二者均表示“必须”,但 must 是指说话人的主观看法,而 have to 则强调客观需要。must 用于一般现在时, have to 有更多的时态形式。I have to wait here because I have no umbrella with me.我不得不在这儿等,因为我没带伞。(强调客观需要)I must recite the te
10、xt this morning.今天早上我必须背会这篇课文。(强调主观意志)(2)must 所构成的疑问句,回答的否定形式通常为 neednt 或 dont have to,意为“不必要”,“不用”,而一般不说 mustnt (表示“禁止”)。Must we hand in our exercise books today?Yes, you must./No, you dont have to/you neednt.我们今天必须交上练习册吗?是的,必须交上。/不,没必要。You mustnt smoke here.你绝不能在这吸烟。(3)must 常表示有根据的、比较确定的推测(只用于肯定的陈
11、述句) ,译为“一定,必定”。Your mother must be waiting for you now.你的母亲现在一定在等着你。(4)must 表示“偏要,偏偏”。Why must you always interrupt me?你为什么非要一直打断我呢?即时演练 3 选词填空:must, neednt, have to(2015北京高考改编)Cant you stay a little longer?Its getting late. I really must go now. My daughter is home alone.(2015四川高考改编)You must be car
12、eful with the camera. It costs!Must I turn down the radio now?No, you neednt.My brother was ill, so I had_to call a doctor in.4shall 和 should(1)shall 用于第一、三人称的疑问句,用来表示征询对方意见或请求指示。Shall I open the window?你要我打开窗子吗?Manager, someone is waiting for you. Shall he come in? 经理,有人在等你,他可以进来吗?(2)shall 用于第二、三人称
13、的陈述句,表示说话人的意愿,有“允诺”,“警告”,“命令”,“强制”,“威胁”等意思。You shall get what you want if you behave well.如果你表现好的话,你就会得到你想要的东西。(表示允诺)He shall be sorry for it one day; I tell you.有一天他会后悔的,我告诉你。(表示警告)(3)should 有时可用于某些从句中,表示说话人惊奇、失望等感情色彩,常译为“竟然,怎么会”。I find it astonishing that he should be so rude to you.他竟然对你这样无理,真让我吃
14、惊。(4)should 作为 shall 的过去式,用于第一、三人称作主语的疑问句,且多用于间接引语中,以征求对方的意见。Mr Lee asked if he should get his visa on time.李先生问能否按时拿到签证。(5)should 表示很大的可能性,多指预期的事,常译为 “按道理说应该”。It should be Mike who has taken away all the materials.应该是迈克拿走了所有的材料。即时演练 4 完成句子(2014江苏高考改编)It was sad to me that they, so poor themselves,
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