情态动词用法及练习

1、情态动词用法及练习1情态动词的语法特征 1） 情态动词不能表示正在发生或已经发生的事情，只表示期待或估计某事的发生。2） 情态动词 除ought(to) 和have (to)外， 没有人称，数的变化，即情态动词都用原形,情态动词后面跟的动词也用原形。 2 can 和could1）can 表示能力；可能 , 注意：could不表示时态 I can swim.提出委婉的请求，用could（注意在回答中不可用could）。 - Could I have the TV on? - Yes, you can. / No, you cant.2）在否定，疑问句中表示推测或怀疑,用could.He coul

2、dnt be a bad man. 他不大可能是坏人。3 比较may和might 表示允许或请求；表示没有把握的推测；may 放在句首，表示祝愿。May God bless you! He might be at home.注意： might 表示推测时，不表示时态。只是可能性比may 小。典型例题 Peter _come with us tonight, but he isnt very sure yet. A. mustB. may C. can D. will 答案B. 表可能性只能用may.此句意可从后半句推出。 4 比较have to和must 1)两词都是必须的意思，have to

3、 表示客观的需要， must 表示说话人主观上的看法，既主观上的必要。My brother was very ill, so I had to call the doctor in the middle of the night.我弟弟病得很厉害，我只得半夜里把医生请来。(客观上需要做这件事)He said that they must work hard. 他说他们必须努力工作。（主观上要做这件事） 2)have to有人称、数、时态的变化，而must只有一种形式。 He had to look after his sister yesterday.3） 在否定结构中： dont have

4、to 表示不必mustnt表示禁止， You dont have to tell him about it. 你不一定要把此事告诉他。 You mustnt tell him about it.你一定不要把这件事告诉他。 5 表示推测的用法 can, could, may, might, must 皆可表示推测，推测的否定形式，疑问形式用cant, couldnt表示。Mike cant have found his car, for he came to work by bus this morning.迈克一定还没有找回他的车，因为早上他是坐公共汽车来上班的。注意：could, might

5、表示推测时不表示时态，其推测的程度不如can, may。 6 will和would 注意： 1）would like； Would like to do = want to 想要，为固定搭配。 Would you like to go with me?2）Will you?Would you like? 表示肯定含义的请求劝说时，疑问句中一般用some, 而不是any。 Would you like some cake?3）否定结构中用will，一般不用would, wont you是一种委婉语气。 Wont you sit down? 7 情态动词的回答方式 问句肯定回答否定回答Need y

6、ou?Yes, I must.No,I needntMust you?/dont have to. 情态动词专练一、Read and choose.（根据上下文选出正确的单词，使对话意思合理、完整，每空分，共10分。）(away, do, meals, brother, family, wash, can, make, housework, can)My name is Ann. I have a happy _. We share the _. My father _ cook the _. My mother can _ the clothes. I can put _ the cloth

7、es. My sister _ _ the dishes. My _ can _ the bed.二、Read and finish the dialogue.（根据上下文意思，将对话内容补充完整，10分。）A: Excuse me! _?B: I often help my mother do housework on weekends.A: _?B: I can wash the clothes.A: _?B: No, I cant cook the meals. But _.A: Great! Your mother is helpful. _?B: My favourite food

8、is chicken. My mother often cooks it.A: Thank you.B: You are welcome.三、 Write the sentences.（根据上下文或提示，写出句子。共10分）1. A: _? B: The monkey can water the flowers. A: _!2. A: _? B: Yes, the rabbit can sweep the floor.3. A: Can you set the table? B: _. But Id like to have a try.4. A: Are you helpful at hom

9、e? B: _.(肯定回答) 四、Read and choose（阅读下面的短文，选择最适合的答句，并将其字母编号填在题前的括号内。每小题分，共10分。）Its Sunday today. I stay at home with my parents. I want to help them do housework. I will(将要) make the bed and clean the bedroom. My father will water the flowers and sweep the floor. My mother will cook the meals and wash

10、 the clothes. After meals, I will clean the table and wash the dishes. Its a busy day for us. But we are very happy.( ) 1. What can you do after meals? A. I can make the bed and clean the bedroom. B. I am helpful. C. I can clean the table and wash the dishes.( ) 2. Can your mother water the flowers?

11、 A. Yes, she can. B. No. C. No, she cant.( ) 3. Can you go to school today? A. I stay at home with my parents. B. Yes, I can. C. No, I cant.( ) 4. Are you happy today? A. Yes, I am. B. Yes, I can. C. No, I cant.( ) 5. What can your father do? A. He can cook the meals and wash the clothes. B. I can water the flowers and sweep the floor. C. He can sweep the floor and water the flowers.五 句型转换. 1. I can cook the meals. 否定句: 一般疑问句: 肯 否回答: 对画线部分提问: 2. Chen Jie can swim. 否定句: 一般疑问句: 肯 否回答: 对画线部分提问: 3. I would like to have some rice. 否定句: 一般疑问句: 肯 否回答: 对画线部分提问: 4. He m