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1、情态动词一、 考点、热点回顾【词汇辨析】1. sometimes/ some times/sometime/ some time: sometimes: “有时”=at times. He is sometimes late for school.some times: “几次” I have been to Nanjing some times.sometime: “某一时刻” I bought it sometime last spring.Well meet again sometime next week. some time: “一段时间” We have to stay here
2、for some time.2. many/ much/ a few/ a little/ few/ little(1)many修饰可数名词，much修饰不可数名词；都表示许多。例如： 许多书 许多牛奶 (2)a few和a little都表示有一点儿，侧重于肯定，相当于some，但a few修饰可数名词，a little修饰不可数名词，例如：He has a few friends in London. -Would you like some coffee? -Yes, just a little. (3)few和little表示几乎没有，侧重否定。few后接可数名词，little后接不可
3、数名词。例如：He is a strange man. He has few words. Hurry up, there is little time left. 【固定搭配】加-ingbe busy doing sth. 忙于做 eg: Mother is busy cooking.look forward to + doing sth. 期待做 eg: Tom looks forward to seeing his father again.Thank you for (doing) sth. 为了感谢你 eg: Thank you for your help.have fun doin
4、g sth愉快地做某事 eg: I had great fun playing in the water.=have a good time doing sth eg: I had a good time playing in the water.have problem/trouble/difficulty (in)doing sth.做某事有困难eg: I have difficulty finishing my homework in 2 hours.【情态动词】 又叫情态助动词。它们具有以下特点： 它们必须与其他动词连用，即：情态动词动词原形表示说话人对所述动作的看法，如需要、可能、意
5、愿或怀疑等。 绝大多数情态动词没有人称和数的变化，即第三人称单数不加-s（以be和have 开头的情态动词短语除外）。 在意义上，情态动词具有“多义性”。例：can既可表示能力，又可表示可能、允许等意义。【情态动词的基本用法】1. can的基本用法： 表示体力或智力上的能力，即“能够，会”，可与be able to转换。例：He can speak English. = He is able to speak English. Can you play basketball? No, I cant. 如果表示将来具备的能力，要用will be able to。例：If I have a goo
6、d sleep, I will be able to do the problem. 表示许可，主要用于口语，书面语一般用may。例：Can we go home now, please? No, you cant. You can only smoke in this room. You cant keep the library books for more than a month. 表示“可能”，与may同义，但一般用在疑问句中。例：What can he possibly want? 在否定句中，否定形式cant表示推测“不大可能”。例：Anybody can make mistak
7、es. The news cant be true. 与第一、二人称连用时，还可以就可能的解决问题的方式或可能的行为提出建议。在这里，也可用could使语气婉转。例：Can / Could we meet again next week? 下周我们可以再见面吗？What shall we do? 我们怎么办呢？ We can / could try asking Lucy for help.我们可以请露茜帮忙试试看。You can / could help me with the cooking. 你可以帮我做饭。2. may的基本用法: 表示“许可”，用can比较口语化。例：You may
8、/ can come if you wish. 如果你想来，你就来。You may not pick flowers in this park. 本公园内不许摘花。（may not表示按规定不许可，如果用mustnt则表示说话人不许可。）May I smoke here? 我可以在这里抽烟吗？No, you mustnt.不行。（mustnt表示明确的禁止。） 肯定句中表示推测，“可能”。例：It may rain tomorrow. 明天可能会下雨。The news may not be true. 这个消息可能不会是真的。注意：如果在疑问句中表示“可能”，通常用can。例：Can it b
9、e true? 那会是真的吗？Who can he be? 他究竟是谁呢？ 【注意】：May I/we？Yes, you may./No, you mustnt.3. must的基本用法: 表示必须，强调说话人的主观意志。例：I must go now, or Ill be late. You must be here by ten oclock. 【注意】：表示“必须“时，must的否定式为neednt ，或dont have to ,而不是mustnt。也就是：Must I/we do it now？Yes, you must . No, you neednt /dont have to
10、.例：Must I go with them?No, you . 表示推测，一般只用于肯定陈述句,表示非常肯定。例：She didnt look at me. She must be angry. 她不朝我看，一定是生气了。He is good at English. He must know the word. 他英语好，准知道这个词。You must be Mr. Jones. 想必您就是琼斯先生吧。4. have to的基本用法：have to可视为情态动词，但它与其他情态动词在用法上稍有不同。其他情态动词没有人称和数的变化，而have to却有人称和数的变化，要视主语的不同而变化。例：
11、I / You / We / They have to. He / She / It has to. You dont have to.Does she have to?have to =have got to，意思是“必须，不得不”。和must不同之处：must强调主观需要have to强调客观需要。例：Sorry, I have to leave now. 对不起，现在我得走了。Ive got to go to a meeting. 我得去参加一个会议。Will he have to work deep into the night? 他将不得不工作到深夜吗？5. need的基本用法：ne
12、ed的基本词义是“需要”，它既可作情态动词，又可作实义动词。 need用作情态动词时，只用于否定句和疑问句。它只有一种形式，后接动词原形。例：I dont believe you need worry. 我相信你没有必要焦急。Need we go so soon?我们需要这么早就去吗？ Yes, we must. / No, we neednt.是的，必须。不，不必。So I neednt tell him, need I? 所以我不需要告诉他，对吧？请比较以下两句话的不同意思：You neednt buy the coat. 你没有必要买那件外衣。（你还没买）You neednt have
13、bought the coat. 你没有必要买这件外衣的。（而你却买了）【注意】：Need I/we？Yes，you must ./No, you neednt / dont have to . need用作实义动词时，有时态、人称和数的变化。如果人作主语，一般后接带to的动词不定式。即need to do sth；如果物作主语，一般后用need to be done 或need doing sth。例如：I need to look up this word in the dictionary. My watch needs mending/to be mended. 我的手表需要修理了。W
14、e dont need to work today. (= We neednt work today.) Does he need to go right now? (= Need he go right now?) 6. had better的基本用法：had better常略作d better。现代语法认为它是一个助动词，因为它后接不带to的动词不定式。had better do sth意思是“最好做某事；还是做某事比较好”。例：Youd better get some sleep. 你最好睡一会儿。Youd better not do that again. 你最好别再做那件事。What had we better do now? 我们现在怎么做才好呢？Hadnt we better tell her the truth? 我们是否最好不告诉她真相?【注意】：Youd better.表示劝告或委婉的命令，对长辈不宜使用。7.could, should, would, might表示推测：. must多用于肯定句中表示把握性极大的推测,意思为“一定、肯定”。如: You have worked hard all day. You must be tired. 你已辛苦工作一整天了,一定累了。The book must be his. His name is on
