求初中情态动词的用法

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求初中情态动词的用法

求初中情态动词的用法
求初中情态动词的用法

求初中情态动词的用法
情态动词 (Model Verbs) 又称为情态助动词 (Model Auxil-iaries).英语中助动词主要有两类:一是基本助动词,如have, do, be;二是情态助动词,如may, must, need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.在大学英语四、六级考试中,情态动词部分重点测试以下内容:
(1)情态动词+行为动词完成式
(2)情态动词+行为动词进行式
(3)情态动词+行为动词完成进行式
(4)某些情态动词的特殊用法
一、情态动词+行为动词完成式
情态动词+行为动词完成式即“情态动词+ have + v-ed分词”,表示对过去行为或动作进行推测、评论或判断.
1. must have v-ed
must have v-ed 表示推测过去某事“一定”发生了.其否定形式为:can’t / couldn’t have v-ed, 表示过去不可能发生某事.例如:
1)Since the ditch is full of water, it must have rained last night.
2)You couldn’t have met my grandmother. She died before you were born.
2. could have v-ed
could have v-ed 表示推测过去某动作“很可能”发生了.例如:
1)“The dictionary has disappeared. Who could have taken it?”
2)“Tom could have taken it. He was alone yesterday.”
3.may / might have v-ed
may / might have v-ed 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人看来稍大些.例如:
I can’t find my keys. I may / might have left them at the school yesterday.
4. ought to / should have v-ed 和 ought not to / shouldn’t have v-ed
ought to / should have v-ed 和 ought not to / shouldn’t have v-ed 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 make fun of him. He is not the one you laugh at but learn from.
5. needn’t have v-ed
needn’t have v-ed 表示过去做了某事,但没有做的必要, 意为“本没必要…”.例如:
You needn’t have waken me up; I don’t 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.”
二、情态动词+行为动词进行式
情态动词+行为动词进行式(即情态动词+ be + v-ing形式),表示推测或评论某动作现在是否正在进行.例如:
1)He must be playing basketball in the room.
2)She may be staying at home.
三、情态动词+行为动词完成进行式
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.
四、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,对此,可参见表1.need 作情态动词时,后面跟不带to 的动词不定式,即 “need to”.通常用在疑问句和否定句中,表示询问是否有“必要”,其否定形式为needn’t,表示“不必”;疑问形式为 Need … do? 极少用于肯定句.例如:
1)I don’t think we need turn the light on at that time.
2)Need you ride a bike to school?
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表1.
2. dare
考试中主要测试dare作情态动词和作实义动词的区别.
情态动词dare 与实义动词dare 在时态、肯定、否定、疑问结构上的对比见表2.
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.

时态 情态动词need 实义动词 need
现 You need (not) do You (don’t) need to do

时 He need (not) do He needs (doesn’t need) to do

过 You needed (didn’t need) to do

时 He needed (didn’t need) to do

将 You need (not) do You will (not) need to do

时 He need (not) do He will (not) need to do




句型 时态 动词
情态动词dare 实义动词 dare
肯定句 现在时 dare to 少用 dare/dares to do
过去时 dare to 少用 dared to do
否定句 现在时 daren’t/dare not do do/does not dare (to) do
过去时 dared not do did not dare (to) do
疑问句 现在时 Dare he do? Do you/Does he dear (to) do?
过去时 Dared he do? Did he dare (to) do
(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:
1)According to the weather forecast, it may rain tomorrow.
2) Any man with a little sense can see that he 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 don’t.或No, you mustn’t. 例如:
“May we leave now?” “No, you mustn’t. You haven’t finished your home work yet.”
4. can 和 be able to
can 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 to
must 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must引起的问题时,如果是否定的答复,不能用mustn’t,而要用needn’t或don’t have to,因为mustn’t是“一定不要”、“一定不能”的意思.例如:
1)You must come to the classroom before eight.
2)It is raining hard outside, but I have to leave now.
3)“Must we do it now?” “No, you needn’t.”
6. used to +v, be used to +v-ing和be used to +v
(1)used to +v意为“过去常常”,“过去一直”;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:
1)He used to smoke. Now he doesn’t.
2)He’s quite used to hard work / working hard.
3)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 rather, 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)I’d rather walk than take a bus.
4)If you don’t 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.
2)I would sooner you hadn’t asked me to speak yesterday.

一楼的回答已经很好了,支持!

1. 含义:表示说话人对有关行为或事物的态度和看法,认为其可能、应该或必要等。
2. 常用情态动词:can(could), may, must
3. 用法:初中阶段要掌握的是:
1) 情态动词后面+ 动词原形。e.g. She can read a book.
2) 常用情态动词的含义
can 能够,能 (could 比can 要委婉)
ma...

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1. 含义:表示说话人对有关行为或事物的态度和看法,认为其可能、应该或必要等。
2. 常用情态动词:can(could), may, must
3. 用法:初中阶段要掌握的是:
1) 情态动词后面+ 动词原形。e.g. She can read a book.
2) 常用情态动词的含义
can 能够,能 (could 比can 要委婉)
may 可能
must 必须 mustn't 禁止

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,会
The classroom can seat thirty students.
这教室能坐三十位学生。
June can drive now.
琼现在会开车了。
2. (表示可能性)可能,可能会
I think the work can be completed ahead of time.
我认为这项工作能提前完成。 <...

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,会
The classroom can seat thirty students.
这教室能坐三十位学生。
June can drive now.
琼现在会开车了。
2. (表示可能性)可能,可能会
I think the work can be completed ahead of time.
我认为这项工作能提前完成。
3. (表示允许、请求)可以
You can't take the book out of the room.
你不可以将这本书拿出室外。
Can I use your pen?
我可以用一下你的笔吗?
4. (表示命令)必须
If you won't keep quiet you can get out.
你如不保持安静,就请你走。
5. (表示偶然发生的可能性)有时会
It can be quite windy there, especially in spring.
那里有时容易刮风,特别在春季。
6. (表示惊讶)究竟;竟至于
What can it possibly be?
到底那是怎么一回事?
二、could的用法
can的过去式;
(用于虚拟语气,表示与事实相反的设想)能;可以;
(表示可能性)可能;
(用于婉转语气)能,可以
三、may的用法
1.表示请求和允许,意思是:可以
He may come if he likes. 如果他想来,可以来
2.表示祝愿,意思是:祝…,(但愿)。
May the friendship between our two peoples last forever. 祝两国人民的友谊万古长青。
3.表示推测,意思是:可能(会),或许(会)。
It may rain this evening. You'd better take an umbrella. 今晚可能要下雨,你最好带上雨伞。
四、must的用法
1.表“必须”。
You must talk to them about their study.你必须同他们谈谈关于他们学习的事。
2.在否定结构中表不许。
You mustn't leave here.你不能离开这儿。
3.表坚定的建议。
You must come and see us as soon as you get to Shanghai.一到上海你得马上来看我们。
4.表推测,暗含有很大的可能性,用在肯定句。
He must be ill. He looks so pale.他肯定是病了。他的脸色那么苍白。
注意:
may 暗含的可能性较小。must 暗含的可能性较大。否定的猜测用can't
The baby can't be ill. He is so active.那宝宝不大可能是病了。他那么活跃。
五、might的用法
might表示的可能性太小,没有足够的说服力去职责别人。
can, could 之间的区别,和 may,might 之间的区别在于,虚拟句和过去时态用后者,表示的可能性比原词小,但大部分时候2者可以互换,不会产生歧义或者对表述造成干扰。
六、should的用法
1.should 作为助动词 shall 的过去式,可以在间接引语中与第一人称主语搭配,表示过去将来时间。
2.should 作为情态动词,通常用来表示现在或将来的责任或义务,译作“应该”、“应当”,这时它可以和 ought to, be supposed to 互换使用。例如:
You should (= are supposed to ) complete your test in time.
你们应该按时做完你们的实验。
3.should 作为情态动词,可以用在条件状语从句中,表示语气较强的假设,译作“万一”、“竟然”,这时也可将 should 置于从句之首,即将 should 放在主语前面,而省略从属连词 if.
If it should rain tomorrow, I wouldn't go. (= Should it rain tomorrow, I wouldn't go.)
万一明天天下雨,我就不去了。
七、 would的用法
1.would是will的过去式,Would you like~?
表示请求、劝说,是很客气的说法。
Would you like a cup of tea?
您愿意喝杯茶吗?
2.主语+would like to~
表示“想要……”的意思上,与…want to~意思一 样,但用此句型较客气。
I want to ask you a question.
3.最基本的虚拟语气句型:
主句用would/ should/ could/ might +动词原形。
八。ought to的用法
ought to 是一个可以加上to 的情态动词其意思与should是一样的,但是ought to 不能用于虚拟语气中表示推测,而should可以
ought to与should意思接近,大多数情况下二者可以互换,但是should谈的是自己的主观看法,ought to则更多反映客观情况,在谈到法律、义务和规定时使用。
如: We should/ought to help each other and learn from each other in our work.
She is your mother, so you ought to support her.
We ought to go and see Mary tomorrow, but I don’t think we will
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may mast need can oughtto dare shall will