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1、Module 5 A Trip Along the Three Gorges Grammar,1.Learn the usage of the Modal Verbs. 2.Use the Modal Verbs properly in the sentences and passages.,Learning aims,Leading-in,1.Dont worry about me, I can take good care of myself. 别为我担心，我会照顾好自己的。,2.The United States will do whatever it can to help Greec
2、e. 美国将尽一切所能帮助希腊。,3.Should our children be taught to swim at school? 我们的孩子应该在学校学游泳吗？,Pay attention to the usage of the Modal Verbs.,情态动词（Modal verbs）本身有一定的词义，但是不能独立作谓语，只能和行为动词一起构成谓语。情态动词用在行为动词前，表示说话人对这一动作或状态的看法或主观设想。 情态动词虽然数量不多，但用途广泛，主要有下列： can (could), may (might), must, need, ought to, dare (dared)
3、, shall (should), will (would), must not,情态动词,一、可兼作行为动词的情态动词： dare 、need dare和need作情态动词时不用于肯定句,没有人称和数的变化（dare的过去式为dared）；作实义动词时可用于肯定句、否定句或疑问句，有人称和数的变化。 He didnt dare to do it. (实义动词) He dare not do it.(情态动词) 他不敢那么做。,He doesnt need to do it. (实义动词) He neednt do it.（情态动词) 他不必做这件事。 注意：need作实义动词时，还可表示“需
4、要”，后接doing/to be done，表被动（需要被. .）。 The classroom needs cleaning/to be cleaned. 教室需要被打扫了。 The tree needs watering (to be watered). 这棵树需要被浇水了。,Two eyes can see more than one. I am so strong that I can lift this stone. He said that Jack couldnt finish his work in such a short time. Could you follow my
5、step? He is only four, but he is able to read. She was able to do it without my help. Will you be able to come to my party tomorrow?,表能力,can could be able to,有时态变化,Grammar-1. Observation(3ms),二、 表示能力的情态动词can, could, be able to 的用法： be able to 能用于各种时态，表示主观意愿，强调要克服困难去做某事。它的过去时用was / were able to，相当于ma
6、naged to do sth. 或succeeded in doing sth.。它的将来时用will be able to。 can / could 只能表示现在或过去的能力，表示主观能力，不表示意愿。例如：,Everyone was able to escape when the earthquake happened. 地震发生时，大家都设法逃了出去。,I am so strong that I can lift this stone. 我是如此强壮以至于能举起这块石头。,can可以表示许可，可代替may You can go home now. 你现在可以回家了。 can表示惊讶，怀
7、疑，不相信的语气 Can the news be true? 这消息会是真的吗？ can表示征求意见，请求，could语气更加委婉。 Could you tell me how to get to the airport? 您能告诉我怎么去机场吗？ can表示偶尔出现的事实。 He can be a hard man sometimes. 他有时挺难相处的。,can的具体用法,【知识拓展】 can 的一些特殊搭配 (1)cant be too/overadj./adv. =cantadj./adv. enough 再也不过分 A parent cant be over/too patient.
8、 We cant drive carefully enough. (2) cant help/choose but do 不得不做 She cant help but drop school.,父母再耐心也不过分。,开车时我们再小心也不为过。,她不得不辍学了。,(3)cant help (to) do 不能帮忙做 cant help doing 情不自禁做 (4)cant/couldnt agree more 十分赞成 (5)it cant/couldnt be better 十分好，非常好,Grammar-2. Observation(3ms),You can go now. I wont
9、let you down. Could I say it in Chinese? May I know your name? Would you mind closing the door? Shall we dance? Might I have a word with you?,语气,强 弱,表许可,征询意见,can, will could / may / would / shall / might,三、表示许可: may / might, can / could might, could 比较委婉, 一般多用于疑问句。 can, may 表达的语言比较随便。 在以could, might
10、 表示征求对方意见或表示请求时，回答应相应使用can, may。,must may, might, can, could,肯定句,语气,强 弱,表可能性(推测),There must be a mistake. It can be true. In those days few workers could support their families. You may walk ten miles without seeing a house. He might get there on time.,Grammar-3. Observation(2ms),语气,强 弱,表不可能(推测),can
11、t, couldnt may not, might not,否定句,She cant be serious. We couldnt have done better. People may not pick flowers in this garden. She was afraid they might not like the idea.,Grammar-4. Observation(2ms),mustnt, shouldnt had better not,表禁止,We mustnt waste our time. They shouldnt leave so soon. Youd bet
12、ter not disturb him.,Grammar-5. Observation(2ms),should, must have to,表义务(应该),有时态变化,Grammar-6. Observation(3ms),You should do what your parents tell you. If you cant finish the book by then, you must come and renew it. This is a lovely party, but we have to go because of the baby-sister. The bridge
13、was not wide enough so that somebody had to give way.,1. 表示否定的情态动词的用法: 部分情态动词的否定式是情态动词中的考点之一。 mustnt 不准, 禁止 neednt 没必要 ( = dont have to ) cant 不能; 不可能 may not 不可以; 可能不 shouldnt 不应该 ( = ought not to ),【点 津】,2. shall和will 的多种意义的区别: shall / will+ 动词原形均可表示将来。 过去式为 should, would。 shall 1）可用于第二、三人称陈述句，表示说
14、话人给对方的命令、 警告、允诺或威胁。当颁布法律规定时，也用shall。2）用于第一、三人称疑问句，表示征求对方的意见。 will 可表示意愿、常出现的动作，在疑问句中表示请求和建议。,Shall the driver wait outside? 司机在外面等着可以吗？ It has been announced that candidates shall remain in their seats until all the papers have been collected. 已宣布，在所有试卷收上来之前，应试者必须呆在自己的座位上。,3. 情态动词短语的使用: would like t
15、o do 想要做 would rather dothan do 宁可也不 would rather + 从句 宁可 had better do. 最好做 used to do 过去常常,【知识拓展】 (1)used todo 过去常常做 be used tov.- ing / n. 习惯于 be used todo 被用来做 (2) used to, would used to过去常做，但现在不做了，常与like, be等状态动词连用 would (do)表示“过去常作，但不强调现在如何，并带有赞扬、厌恶等感情色彩。,4.部分情态动词的问与答: (1) Need I? Yes, you mus
16、t. /No, you neednt (dont have to). (2) Must I? Yes, you must. /No, you neednt (dont have to). (3) May I? Yes, you may. (=Yes, certainly/of course.)/ No, you may not. (=No, you cant/mustnt.) (4)Might/Could I? Yes, you may/can.,5. must和have to用法的区别: must表示说话人的主观看法，而have to表示客观的需要； mustnt表示 “决不能”“禁止” “一定不要”，而dont have to表示“不必要” (英国英语中常用neednt) 。,Class exercises,1.（2015福
