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初中英语中情态动词的基本用法

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1、初中英语中情态动词的基本用法：can, could 1. 表达“能力”。 2. 表示“许可”。 3. 有礼帽地提出“请求”。（用于疑问句） 4. 谈论“可能性”。 5. 当主语为事物时可以表示“惊异”。 We can use the computer now, but we couldnt two month ago. You can go now. Could you be here at eight oclock tomorrow morning? He cant be the manager, for I saw him go to Canada yesterday. What on earth can this mean? 在表达“能力”时，可用 be able to 来取代 can。要注意的是：可在 be able to 前加肋动词或情态动词以表达更多的时态或情态，can 或 could 前则不可。 No one is able to do it. ( = No one can do it.) We shall be able to finish the work next

2、week. I havent been able to find any jobs.may might 1. 表示“允许” 2. 请求“许可”（用于疑问句） 3. 谈论“可能性” You may go home now. He said that I might drink some beer. May I watch TV this evening? - May I use you pen? - Yes, you may. He may/might come tomorrow.must 1. 表达“义务”、“责任” 。 2. 进行“肯定的推断”。 3. 其否定式 mustnt 表示“（说话人）禁止，不准”；用来代替 may not 表示“不许可”。 Everybody must obey the rules. I must go now. This work must be finished as soon as possible. The Chinese language must have the largest number of speakers. You mustnt le

3、nd the book to others. 在表示“客观需要”时，用 have to 而不用 must。另外可在 have to 前加肋动词或情态动词以构成更多的形式。must 前则不可。 You dont have to worry about that. He had to spend his childhood in hard work, helping his father on their small farm. The students of today will have to how to use the computers.shall should 1. 表示“必要性”。 2. 征求“意见”或“看法”，请求指示。 3. 主语为二、三人称时，表达说话人强烈的意志和决心，有威胁或震慑听话人的作用。 We should be strict in all our work. Where shall I wait for you? Shall we start the meeting now? Tell him that he shall have the book tomorrow. You shall do as I say. Young people should learn how to use computers. 在表示“必要性”时，可用 ought ot 来代替 shall，语气更正式一些。will would 1. 表示“必然性”。 2. 表达“意愿”或“意志”。 3. 询问对方的意愿或提出请求。（用于疑问句） Fish will die out of water. Everyday she would get up at 6:00 and light the fire. I will tell you all about it. Well help him if he asks us to. I wont go home now. I promised that I would do my best. Would you like another cup of tea? Will you go with me? Will you please . ?

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