Must用法全接触
一、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。
二.在否定结构中表不许。
You mustn't leave here.你不能离开这儿。
三.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。
四.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.关于must的简短回答:
Must I clean the dining room at once? 我必须马上打扫膳厅吗?
Yes, you must. 是的。
No, you needn't.不必马上打扫。(No, you don't have to.)
must的情态动词短语是什么?
你列举的这两组句子中的must就是其做情态动词的用法,但是它们之间有所不同.试分析如下:第一句中的must 除了表示主观意愿的"必须"以外,还可以表示"推测",语气十分肯定.而第二句中的"must"则表示"必须",含有命令的意味,是情态动词的一种用法,除了"must"以外,其它情态动词can/could,may/might等都有类似的用法
含有情态动词must的句子改为一般疑问句,否定句分别是怎样的
must这样的情态动词属于助动词,叫做情态助动词。
情态助动词1.情态助动词包括will(would), shall(should), can(could), may(might), must, need, dare, ought to, used to, had better后接原形不定词。
2.情态助动词不受主语的人称和数的限制。
3.两个情态助动词不能连用。
协助主要动词构成谓语的词叫助动词(Auxiliary Verb),也叫辅助动词。
被协助的动词称作主要动词(Main Verb)。
助动词用来构成时态和语态。
助动词具有语法意义,但没有词汇意义,不可单独作谓语。
它没有对应的汉译,例如: He doesn't like English. 他不喜欢英语。
(does是助动词,无词义;like是主要动词,有词义)
【情态动词的句子的反义疑问句是什么?如:Imustgohomenow,...
12.当陈述部分带有情态动词must表示“必须”时,疑问部分用mustn't.如: You must work hard next term,mustn't you? 但若表推测这层含义时,不能用must,而要根据陈述部分的不定式结构(即must之后的动词)以及含义采用相应的动词形式.如: You must have made a mistake,haven't you? 13.当陈述部分含有情态动词used to时,疑问部分可用usedn't或didn't.如: The old man used to smoke,didn't he?或usedn't he? 14?当陈述部分带有情态动词ought to时,疑问部分用oughtn't或shouldn't.如: He ought to know the answer,oughtn't he
【must作谓语的句子,反义疑问句是isn'tXXX吗?为什么】作业帮
不能判断,具体要根据句子。
拿几个例子给你看下。
Something must be done about it. 必须得想个办法。
比如这句,在过去时态中可以用,在现在时态也能用,因为be动词因must 还原成原型。
无法判断。
His new novel was a must for all lovers of crime fiction. 他的新小说是罪案小说爱好者必须一读的。
(表示当时是罪案小说爱好者必须一读)
情态动词:can may must的用法
情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。
情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语 一、 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. 2) 表示请求和允许。
-----Can I go now? ----- Yes, you can. / No, you can't. 此时可与may互换。
在疑问句中还可用could, might代替,不是过去式,只是语气更委婉,不能用于肯定句和答语中。
---- Could I come to see you tomorrow? ---- Yes, you can. ( No, I'm afraid not. ) 3) 表示客观可能性(客观原因形成的能力)。
They've changed the timetable, so we can go by bus instead. This hall can hold 500 people at least. 4) 表示推测(惊讶、怀疑、不相信的态度),用于疑问句、否定句和感叹句中。
Can this be true? This can't be done by him. How can this be true? 二、 may, might 1) 表示请求和允许。
might比 may语气更委婉,而不是过去式。
否定回答时可用can't 或mustn't,表示“不可以,禁止”。
----Might/ May I smoke in this room? ---- No, you mustn't. ---- May/Might I take this book out of the room? ---- Yes, you can. (No, you can't / mustn't. ) 用May I...?征徇对方许可时比较正式和客气,而用Can I...?在口语中更常见。
2)用于祈使句,表示祝愿。
May you succeed! 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. 三、 must, have to 1) 表示必须、必要。
You must come in time. 在回答引出的问句时,如果是否定的,不能用mustn't(禁止,不准),而用needn't, don't have to(不必). ---- Must we hand in our exercise books today? ---- Yes, you must. ---- No, you don't have to / you needn't. 2) must是说话人的主观看法, 而have to则强调客观需要。
Must只有一般现在时, have to 有更多的时态形式。
1. he play isn't interesting, I really must go now. 2. I had to work when I was your age. 3) 表示推测、可能性(只用于肯定的陈述句) 1. You're Tom's good friend, so you must know what he likes best. 2. Your mother must be waiting for you now. 四、 dare, need 1) dare作情态动词用时, 常用于疑问句、否定句和条件从句中, 过去式形式为dared。
1. How dare you say I'm unfair? 2. He daren't speak English before such a crowd, dare he? 3. If we dared not go there that day, we couldn't get the beautiful flowers. 2) need 作情态动词用时, 常用于疑问句、否定句。
在肯定句中一般用must, have to, ought to, should代替。
1.You needn't come so early. 2. ---- Need I finish the work today? ---- Yes, you must. / No, you needn't. 3) dare和 need作实义动词用时, 有人称、时态和数的变化。
在肯定句中,dare后面常接带to的不定式。
在疑问句和否定句中,dare后面可接带to或不带to的不定式。
而need后面只能接带to的不定式。
1. I dare to swim across this river. 2. He doesn't dare (to) answer. 3. He needs to finish his homework today. 五、 shall, should 1) shall 用于第一人称,征求对方的意见。
What shall we do this evening? 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) 六、 will, would 1) 表示请求、建议等,would更委婉。
Will / Would you pass me the ball, please? 2) 表示意志、愿望和决心。
1. I will never do that again. 2. They asked him if he would go abroad. 3) would表示过去反复发生的动作或某种倾向。
would表示过去习惯时比used to正式,且没有“现已无此习惯”的含义。
1. During the vacation, he would visit me every other day. 2. The wound would not heal. 4) 表示估计和猜想。
It would be about ten o'clock when she left home. 七、 should, ought to 1) should, ought to表示“应该”,ought to表示义务或责任,比should语气重。
1. I should help her because she is in trouble. 2. You ought to take care of the baby. 2) 表示劝告、建议和命令。
should, ought to可通用,但在疑问句中常用should。
1. You should / ought to go to class right away. 2. Should I open the window? 3) 表示推测 should , ought to (客观推测), must(主观推测)。
1.He must be home by now. (断定他已到家) 2.He ought to/should be home by now.(不太肯定) 3. This is where the oil must be.(直爽) 4. This is where ...
情态动词must的用法
情态动词:1)本身有一定的词义; 2)只能和其他动词原形构成谓语;3)没有人称,数的变化; 4)除ought, used和have 外,后面只能接不带to 的不定式; 5) 个别情态动词过去式用来表达更加客气, 委婉的语气, 时态性不强;1)表肯定推测,意为“一定,必定”(只用于肯定句中);否定推测用can't,意为“一定不”。
The bag must be Anne's because it has her name on it.That man can't be Prof. Lee. He has gone toXiamen.肯定回答:Yes, ...must.2)must表示主观义务,意为“应该,“必须”否定回答:No, ...needn't /don't have to.3)mustn't表示“不准”、“不允许”、“禁止”。
如:Youmustn't break the rules/laws.4)只有现在时一种形式(在宾语从句中可以表示过去)e.g. He said she must go with me.
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