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初中英语情态动词课件

发布时间:2013-09-17 17:08:24  

情态动词复习

3) 表示推测、可能性(不用 于疑问句)。
? might不是过去式,它所表示的可 能性比may小。 1.He may /might be very busy now. 2.Your mother may /might not know the truth.

can, could
? 1) 表示能力(体力、知识、技能)。 Can you lift this heavy box?(体力) Mary can speak three languages.(知识) Can you skate?(技能)

? 此时可用be able to代替。Can只有一般现在 时和一般过去式;而be able to则有更多的时 态。 I’ll not be able to come this afternoon.
? 当表示“经过努力才得以做成功某事”时应 用be able to,不能用Can。如: He was able to go to the party yesterday evening in spite of the heavy rain.

3) 表推测可能性。
肯定句中:can表示理论上的可能性;may表 示事实上的可能性,如: In Yuyao, sometimes it can be really cold. Tom may go camping with us tomorrow, but he is not sure. 否定句和疑问句中,只能用can表猜测可能性。 Someone is knocking at the door, and who can it be? It can’t be Tom because he has gone to Beijing.

? 2) shall 用于第二、三人称,表示说话人给对 方的命令、警告、允诺或威胁。 ? 1. You shall fail if you don’t work hard.(警 告) ? 2. He shall have the book when I finish it.(允诺) ? 3. He shall be punished.(威胁)

1) 表示“应该”,常用来表示劝告、建议;认 为“某人应该做某事”或“有义务责任做某 事”。 We should obey traffic laws. You shouldn‘t watch TV every day。 You shouldn’t have made this kind of silly mistakes. Tom should have brought his report today. 这时它可以和 ought to, be supposed to 互 换使用

五. should

2) Should (ought to)表示推 测时,是指有一定根据的推测, 意为“可能、该”
? ---When can I come for the photos? I need them tomorrow, ? ---They ____ be ready by 12:00

3. 表示惊讶的语气
? You can never imagine such a gentleman should be so rude to a lady.

六: will 和would
1)表示意志或意愿:决心,愿意,…… ? We will do our best to save the child. 我们会尽力抢救这个孩子。
? I told her to stop crying, but she just wouldn’t listen. 我叫她别哭,可她 就是不愿听。

2)表示请求、建议或征求对方意见时, 用Would you…? 比用Will you…?更婉 转。如:
? Will/Would you please keep the door open?请让门开着好吗? ? Will/Would you go with me?你愿意和 我一起去吗?

相关情态动词
? would like表示愿意 I would like to have a word with you. 我想同 你说句话。
? would rather…than…宁愿……也不愿…… I would rather fail than cheat in the examination. 我宁愿考不及格,也不愿意考试 作弊。

七。need
? 1.need作情态动词无人称或数的变 化, 后接动词原形,多用于否定句和疑 问句中。 ? 如:You needn‘t worry.你不必担心 ? I needn’t

have brought the raincoat with me in such a sunny day yesterday.

2.由need引出的一般疑问句,肯定回 ? 答常用must或have to;否定答语常用 needn't. 如:
—Need I answer the question? 我需要回答那个问题 吗? —Yes, you must. ---Yes, you have to.是的,你必须回答。 ---No, you needn't./you don’t have to不,不必 了。

由must引出的一般疑问句,肯定回答用 must,否定答语用needn't或 don't have to。如:
? —Must I do the work now? 我必须现在干这个 活吗?

—Yes, you must /have to. ---No, you needn't /don't have to.

Need 做行为动词
? ? ? ? Need sth Need to do sth Need doing=need to be done表被动 否定: don’t need

八:dare 敢
? 通常用于疑问句、否定句或条件句中 Dare you ask him?你敢问他吗? She dare not go out alone. 她不敢单独出去。
I don’t know whether he dare try. 我不知道 他敢不敢试。

注意:
? 1.有过去式dared。如:
No one dared speak of it. 没有人敢提及此事。

2. How dare you/he/she/they…?表示说话人对 某人的行为表示愤慨。如: How dare you ask me such a question?你怎敢问 我这样的问题?
3. I dare say表示“我相信,我认为,可能”。如: I dare say you are right. 我认为你是对的

作行为动词:可用于各种句子 中;在疑问句或否定句中,to 经常被省略。如
? Did anyone dare (to) admit it?有人敢 于承认吗? He did not dare (to) leave his car there. 他不敢把车停放在那里。 If he dares to show up at her house I’ll be surprised. 如果他敢出 现在她的房子里,我会感到吃惊。

注意点一:
? 表推测可能性:must, can, may, might, can’t, couldn’t ? --I heard they went skiing in the mountains last winter. ? -- it ____ true because there was little snow where.

二、表推测的用法
? 1. must have done过去肯定做了某事 Since the road is wet, it must have rained last night. 不存在 mustn‘t have done 的形式。其否定 或疑问形式须用 can(could) 来表示. 例如: He can't have missed the way. I drew him a map. “The dictionary has disappeared. Who could have taken it?”

may / might have done
? I can‘t find my keys. I may / might have left them at the school yesterday. 我找不到我的钥匙了。我可 能昨天把他们落在学校了。 ? John may/might not have passed the exam; he looks very sad.约翰可能没有 通过考试。他看起来很忧伤。

3.can/could have done 表推测一般用在 否定句和疑问句中,表示不相信或怀疑 的态度。
? Can/Could he have passed the exam? 他可能通过了考试吗? ? I think that he couldn’t/can't have gone abroad. I saw him just now.我 认为他不可能出国了。我刚才还看见他 了。


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