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1、高二英语Grammar for Unit13 Model Verbs知识精讲一. 本周教学内容Grammar for Unit 13 Model Verbs二. 教学重点、难点几组易混淆词的辨析（一）具体内容情态动词（Model Verbs）又称为情态助动词（Model Auxiliaries），主要有can, may, must, could, might, shall , should, will, would, ought to, need, dare等。情态动词与其他动词连用表示说话人的语气。情态动词可表达建议、要求、可能和意愿等。情态动词没有人称和数的变化。（1）情态动词+动词完成式
2、：must have done （2）情态动词+动词进行式：must be doing （3）情态动词+动词完成进行式：must have been doing （4）某些情态动词的特殊用法：need（二）情态动词+动词完成式情态动词+动词完成式即“情态动词+ have + done分词”，表示对过去行为或动作进行推测、评论或判断。1. must have donemust have done 表示对过去某事的肯定猜测。其否定或疑问形式都用can（could）来表示。例如：Since the road is wet, it must have rained last night.He cant
3、 have missed the way. I drew him a map.“The dictionary has disappeared. Who could have taken it?”当然对现在发生或将来发生的事情，要用must do 表示猜测，否定为cant do。He must understand that we mean business.You must be hungry after a long walk.2. may / might have donemay / might have done 表示推测过去某事“也许”发生了.may 比 might 表示的可能性在说话
4、人看来稍大些。例如：I cant find my keys. I may / might have left them at the school yesterday.3. could have done 在肯定句型中，往往用作委婉的批评。本应该做什么。而没做；有时也用作猜测。You could have told us earlier.Tom could have taken the dictionary.4. ought to / should have done和 ought not to / shouldnt have doneought to / should have done 和
5、 ought not to / shouldnt have done 用于对已发生的情况表示“责备”、“不满”，分别表示“本应该”和“本不应该”。例如：（1）With all the work finished, I should have gone to the party last night.（2）You ought not to have made fun of him. He is not the one you laugh at but learn from.5. neednt have done neednt have done 表示过去做了某事，但没有做的必要， 意为“本没必要
6、”。例如：You neednt have waken me up ; I dont have to go to work today.注：表示推测过去某动作发生的可能性时，就表示的可能性程度而言，must最大，could其次，may更次之，might最小。例如：“I wonder how Tom knew about your past.” “He must / could / may / might have heard of it from Mary.”（三）情态动词+动词进行式情态动词+行为动词进行式（即情态动词+ be + doing形式），表示推测或评论某动作现在是否正在进行。例如：
7、（1）He must be playing basketball in the room.（2）She may be staying at home.（四）情态动词+动词完成进行式情态动词+行为动词完成进行式（即情态动词+ have been + v-ing 形式），表示推测或评论过去某动作是否正在进行或一直在进行。例如：（1）They should have been meeting to discuss the problem. （2）He may / might have been buying stamps in the post office when you saw him.三.
8、某些情态动词的特殊用法1. need 考试中主要测试 need 作情态动词与作实义动词的区别。情态动词need与实义动词need 在时态、肯定、否定结构上的对比见下表。时态情态动词need实义动词 need现在时He need（neednt）doNeed he do.?He needs（doesnt need）to do过去时He needed（didnt need）to do将来时He need（neednt）doNeed he do.?He will（not）need to do注：need 一般用于否定句或疑问句。 2. dare考试中主要测试dare作情态动词和作实义动词的区别。情态动
9、词dare 与实义动词dare 在时态、肯定、否定、疑问结构上的对比见下表。句型情态动词dare 实义动词 dare肯定句现在时 dare to 少用过去时 dare to 少用现在时 dare/dares to do过去时 dared to do否定句现在时 darent/dare not do过去时 dared not do 现在时 do/does not dare (to) do过去时 did not dare (to) do 疑问句现在时 Dare he do? 过去时 Dared he do? 现在时 Do you/Does he dear (to) do? 过去时 Did he d
10、are (to) do 3. can 和 may考试中主要测试can，may或could，might表示可能性的区别及对may构成的疑问句的回答。（1）can, could, may, might都可以表示可能性。can, could表示潜在的可能性或理论上或逻辑判断上存在的可能性；而may，might则表示事实上的可能性。此外，can还具有“有能力”的意思，而may与might则不具此意。例如：According to the weather forecast, it may rain tomorrow.Any man with a little sense can see that he
11、is wrong.（2）May I / we ? 这一类疑问句的肯定回答为Yes, please.或Certainly；否定回答为Please dont.或No, you mustnt. 例如：“ May we leave now? ” “ No, you mustnt. You havent finished your home work yet.”4. can 和 be able tocan 与 be able to 都可以表示能力，但两者在用法上有点差异：can（could）表示主观能力，不表示意愿，它的将来时用will be able to；be able to表示主观意愿，强调要克服
12、困难去做某事。例如：（1）My grandma is over seventy, but she can still read without glasses. （2）He is able to give up his bad habits.5. must 和 have tomust 和 have to 都可以表示“必须”，但有几点区别：（1）must 强调“内在的职责”、“义务”，而have to 强调“外界压力”、“不得已而为之”。（2）have to可用于多种时态，而must一般用于现在时，其过去时与将来时分别由had to与shall / will have to代替。（3）在回答mu
13、st引起的问题时，如果是否定的答复，不能用mustnt，而要用neednt或dont have to，因为mustnt是“一定不要”、“一定不能”的意思。例如：（4）You must come to the classroom before eight. （5）It is raining hard outside, but I have to leave now. （6）“Must we do it now?” “No, you neednt.”6. used to +do，be used to +doing和be used to +do（1）used to +v意为“过去常常”，“过去一直”
14、；be used to +v-ing / n（名词）意为“习惯于”；be used to +v意为“被用来（做某事）”。（2）used to只表示过去，而be used to +v-ing / n可表示现在、过去或将来。例如： （3）He used to smoke. Now he doesnt. （4）Hes quite used to hard work / working hard. （5）The knife is used to cut bread.7. 用作情态动词的其他短语would rather, would sooner, would（just）as soon, had rat
15、her, had better, had sooner, can not but, may（just）as well等可用作情态动词。例如：（1）The soldier would sooner die than surrender. （2）The brave soldier would as soon die as yield to such an enemy. （3）Id rather walk than take a bus. （4）If you dont like to swim, you may just as well stay at home.注：这些短语后一般直接跟动词原形。would（had）rather, would（had）sooner, would（just）as soon后可跟that 引导的从句，that 常省去，从句要用虚拟语气。对现在和将来的假设用过去时，对过去的假设用过去完成时。例如：（1）I would rather you came on Sunday.
