oughtn t是不是ought 的否定例如ought you finish the homework?a ought not to b ought nor c oughtn撇t
ought to 的形式和用法 情态动词 ought to 只有一种形式：肯定式 否定式 缩略否定式 ought to ought not to oughtn't to ought to 的基本用法：Part.I 表义务,用于各种句式 (1) You don't look well.You ought to go to see the doctor.你气色不好,应该去瞧大夫.(2) You oughtn't to smoke so much.你不应该抽这么多烟.(3) Ought you to smoke so much?你应该抽这么多烟吗?(4) 一般来说,ought to 用以指将来,指现在时则用于进行式 At you age you ought to be earning your living.你到这个年龄应当自食其力了.(5) ought to 也要用于完成式,在肯定句中表未完成的动作 You ought to have done something to help him.你本应该做些事去帮助他.(6) 在否定句中,则表已完成的动作 You oughtn't to have married her,David.It was a great mistake.你本不该跟她结婚,戴维,那是个大错误.(7) 在间接引语中表过去时形式不变 He said you ought to tell the police.他说你应当去报警.Part.II 表推测,暗含很大的可能,其语气较 must 弱 (1) Ask John.He ought to know.去问约翰吧.他该知道.(2) These plants ought to reach maturity after five years.它些植物五年后就该长成了.[注]在美国英语中,ought to 在否定和疑问句中可省去 to,如：(1) You oughtn't smoke smoke so much.你不应该抽这么多烟.(2) Ought you to smoke so much?你应该抽这么多烟吗?[注]ought to 往往与should同义,在生活交际中人们多用后者,但有时 ought to 有针对性,should 则表一般的忠告,试比较：(1) We ought not to tell falsehoods.我们可不应该说谎话.(2) We should not tell falsehoods.你们不应该说谎话.
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（一）情态动词详细用法讲解一,概说：情态动词（Modal Verb)：情态动词用来表示说话的人对所叙述的动作或状态的看法,如表示命令,允诺,请求,拒绝,愿望,义务,必要,可能,敢于,需要等情态动词主要有：can/ may/must/ dare/ shall/ will/would1.情态动词不能单独作谓语,必须和实意动词或连系动词的原形（有时和这些动词完成和进行式）一起构成谓语例如1：We must study hard .我们应该努力学习（must +不带to不定式study充当谓语）例如2：He can speak a little English .他会说一点儿英语（can +不带to不定式speak充当谓语）例如3：He must have gone home.他准是/一定是回家了（must+不带to不定式have gone 充当谓语）例如4：He must be waiting for us .他一定是在等我们（must+不带to不定式be waiting充当谓语）2.情态动词没有人称和数的变化,第三人称单数的出现时,情态动词也不需要加s或者es例句1. I can write in English.我会用英语写例句2.He can write in English .他会用英语写（不必说：He cans write in English )3.否定句和疑问句的构成A:否定式：主语+情态动词+not +动词原形例如1.You can not speak French.你不会说法语例如3.He may not come today .他今天可能不会来例如3.You need't look at me like that .你不必那样瞧我B:疑问式：情态动词+主语+动词原形例如1.May I ask you a question about grammar ?我可以问你一个语法问题吗?Would you like to go with me ?你想和我一起去吗?4.有些情态动词有过去式,有的过去式和它们的原形相同A有过去式的情态动词有：shall--- will--- can--- may--- need--- dare---daredB过去式不变的情态动词有：must- ought---ought to5.情态动词没有动词不定式,必要时用别的词语来表示例如1：I'd like to be able to dance.我希望能跳舞（不可以说...to can dance)例如2.You are going to have to work harder .到时候你必须更加努力工作（不能说...to must work harder)二,can和could详细用法讲解can的用法1.表示能力例句1. He can speak French very well .他法语讲得很好例句2 .Can you swim ?你会游泳吗?例句3. We can hear birds singing.我们能听到鸟儿在歌唱2.表示可能性例句1. Anybody can make mistakes.任何人都会犯错误例句2 He can not be there now.他现在不可能在那儿例句3. The weather can be very nice in winter.冬季气候可能很好can在作为“能力”或“可能性”的意义用时,不能表示将来时间,如果要表示将来时间,的用shall/will be able to +动词原形这一句型.例如By the end of this year, you will be able to speak in English (表示能力）到今年年底你会用英语说话了Will you be able to come?（表示可能性）你明天可能来吗?3.表示允诺或请求许可You can go now.你现在可以走了You can have my seat , I am going now.你可以坐我的座位,我现在要走了Could用法1.表示“能力”或“可能性”,作为can的过去式She can't sing now, but she could when she was young .她现在不能唱歌了,但她年轻时能He said that he couldn't come .他说他不能来She asked whether she could take the books out of the reading-room她问可不可以把书拿出阅览室2.代替表示现在时间的动作,但口气/语气比较/更加委婉Could you show me the way ?请你给我指一下路好吗?请你帮助我学英语语法好吗?Could you help me with my English grammar ?can/could用于疑问句和否定句中详细用法讲解1.can/could用于疑问句和否定句中,表示“怀疑”,“不相信”等态度Can /Could the news be true?这个消息会是真的吗?He could/can he be so careless?他怎么会这样粗心?It surely couldn't /can't be four o'clock already不可能已经四点钟了2.can/could用于疑问句和否定句中后面跟动词不定式（不带to)的完成式,表示对过去发生事件的”怀疑“或不肯定,而could比can更加表示说话人的”不肯定“的语气.例如下面句子My umbrella has disappeared, who could have taken it ?我的伞不见了,谁会拿呢?Can he have said that ?他会说这样的话吗?He can not have said that .他不可能说这样的话could +have done这一结构可表示过去可能完成,但事实上并没有实现的动作,例如下面句子 He could have gone by bus,butHe went on foot.他本来可以坐车去得,但他走路去了I could have passed the test,but I failed .我本来能考及格的,但我没及格三may和might详细用法讲解may的用法1.表示”允许”或“请求别人允许”May I come in ?---yes ,you do (yes, you may )我可以进来吗?----请进.May I borrow your dictionary ?我可以借用你的字典吗?2.表示说话人的猜测,认为某一事情或许会发生,或某种情况可能会存在,例如下面句子He may be ill .他也许病了.The news may not be true .消息也许不真实. might的用法1.表示允许,请求或可能性,作为may的过去式2.The boy asked whether he might go to the cinema .男孩问他可不可以去看电影She was afraid that they might not like the idea .她担心他们可能不赞成这个想法2.代替may,表示可以做得的事,或可能发生的事The radio says that it might rain today.收音机说今天有可能下雨It might be worth thinking about .这一点可能值得考虑这里might 不是may
的过去式,两者表示的时间是一样的,只是用might 时口气比较委婉,或实现的可能性更小些.may和might用在感叹句中may和might用在感叹句中,表示一种祝愿或愿望,例如下面句子May you succeed.祝你成功.He hoped that we might have a very happy holiday .他祝愿我们过个非常愉快的节日may和might常用在目的状语从句中He was studying English so that he might read English books他正在学英语,以便能阅读英语书籍He died so that the others might live为了使其他人能活下去,他自己牺牲了may和might后加动词不定式（不带to）的完成式这一结构表示对过去的可能性的猜测,might较为含蓄委婉,或更加不肯定.He may (might) have missed the train .他也许么有赶上火车.She may(might) have gone.他也许走了.may /might+have done :这一结构,说明某一事情在过去没有实现并含有”劝告“甚至”“责备”的意思You might have helped me with my work.你本应帮助我工作才对（但是你没有)He might have answered my letter.他本应给我回封信（可是他没有回）You might have come earlier .你本应早点来（可是你没有早来）四.must详细用法讲解must用法1.表示命令或义务,有“必须”,"应该"之意You must come earlier tomorrow.你明天得早点来You must wipe your feet before coming into the house.进入这房子以前,你必须把脚擦一擦The pupils were told that they must write more neatly.学生们被告知他们必须书写得更工整些.2.must的否定式表示语气比较强烈的“不应该”“不许可”“禁止”We must't waste our time.我们不应该浪费时间.Books must not be taken out of the reading-room.不准把书拿出阅览室.3.在表示“没有义务”的意思时用need notYou need't go home , but I must .你不必回家,但我得回去.Must I be at the meeting by eight o'clock.No, you needn't , but don't be too late .我一定要在八点以前到会吗?不,不必,但也不要太迟.Must we hand in our exercises today ?我们必须今天交练习吗?No, you needn't .不,不必今天交.4.表示推测,有“一定” “准时”之意（只用于肯定式）You have worked hard all day long. You must be tired .你苦干了一整天了,一定累了吧.Tom left here at four o'clock , It's five now, He must be home .汤姆是四点钟离开这儿的,现在五点了,他一定到家了.5.当
must表示推测意义时,它的否定式用can not 而不是must notHe looks so young, He can not be thirty.他看上去那么年轻,他不会有三十岁了吧must加动词不定式（不带to）的完成式：这一结构表示对过去事件的推测,有“一定”“准是”之意The ground is wet, It must have rained last night地面是湿的,昨晚一定下雨了Tom is absent, He must have been ill汤姆昨天缺席了,他一定是病了备注：概结构表示的推测是指对过去事情/事物的推测,前面4,5是指对现在或将来情况的推测.五,have to和must详细用法精品讲解have to +动词原形：have to +动词原形和must都用于谈论义务,表示“不得不”,“必须”.但是两者意思不尽相同.1.must用于主观上必须做得事情；二have to含有客观条件使得必须如此做的意思.I must study hard.我必须努力学习（我自己想努力学习）（表示说话对自己主观上的一种态度）you must go to school on time .你得准时/必须准时上学（说话人要听话人必须要做的事情）（表示说话对听话人主观上的一种态度）I have to study hard我不得不努力学习（表示客观条件/情况迫使说话人必须要做的事情）you have to go to school on time.你不的不准时上学（表示客观上的某种制度或者规定迫使听话人必须准时上学,而不是说话人要求听话人必须要做的事情）.2.have to有较多的时态,must却没有I had to get up at five o'clock every morning when I was young .我年轻时每天早上不得不5点钟起床（表示过去时）I shall have to get up very early tomorrow .我明天必须起得很早（表示将来时）六shall详细用法精品讲解shall用法:1.shall作为情态动词用于第二,三人称,表示说话者的一种决定,允诺,或威胁He shall do it , whether he wants to or not .不管他愿不愿意,他必须做这项工作（命令）You shall have an answer by tomorrow .到了明天你会得到答复的（允诺）2.在疑问句中,情态动词shall用于第一,三人称,表示说话人征求对方的意见或指示Shall I turn on the light?我可以开灯吗?（征求对方意见）Shall he come to see you ?他需要来看你吗?七will详细用法精品讲解1.will作为情态动词可用于各种人称,表示“意志” “意愿”和“决心”等I will do my best .我一定尽力而为.（表示意志）If you will wait a moment , I will come with you .如果你愿意等一会儿,我就和你一起来（表示意志）They won't watch TV tonight今晚他们不看电视（表示决心）2.will还可以表示习惯性的动作或状态He will sit for hours watching TV=He will sit watching TV for hours.他总是坐几个小时看电视Fish will die out of water.鱼儿离开水就不能活3.will在疑问句中用于第二人称时表示说话人向对方提出请求或询问,Will you pass me the book?请你把这本书递给我好吗?Won't you have some tea ?( some表示希望能得到对方肯定回答）请喝点茶好吗?八should详细用法精品讲解should的用法1.表示“应当”或者“应该”的意思You should finish your homework before going out .你应该在外出之前完成家庭作业.You should listen to the teacher's advice , you should pay attention to the spelling in your writing.你应该听老师的忠告,在写作中你应该注意拼写.2.表示“预测” “可能”You should receive the parcel by next week.下星期你可能会收到邮包They should be home by now .他们现在可能到家了3.表示惊奇,赞叹,不满等情绪Why should you come so early today ?你今天怎么来得这么早（表示惊奇）Why should I go?我为什么要去?（表示不满）should后跟动词不定式（不带to)的完成式:这一结构指的是过去的事情.1.肯定句：说明某件事本应该完成而未完成You should have come earlier .你本应该早一点来.（但是你来晚了.）All the students should have passed the examination .所有的学生本应该都通过考试.（但是还是有人不及格.）2.否定句：表示发生了不应该发生的事情或者作了不应该做的事情.You should not have gone alone without companion .你本不应该没有同伴独自一个人去.（但是你是独自一个人去了.）He should not have worked late into the night.他不应该工作到深夜.（但是他工作到了深夜.）九：would详细用法精品讲解would的用法1.would是will的过去式,用于各种人称,表示过去时间的“意志", "愿望”和“决心”等He told me that he would leave the following day.他告诉我他第二天离开.He promised that he would do everything to help us .他答应要尽一切可能来帮助我们.2.would用来表示现在或将来时间,表达说话人本身的意志,或作礼貌的请求,邀请,语气较为婉转.Would you lend me a hand with the luggage?请帮我搬搬行李好吗?would you mind my opening the window ?你介意我打开窗户吗?或者,我打开窗户,你介意吗?He would like to have a cup of tea .他想喝一杯茶.3.would表示过去习惯发生的动作.Every morning he would go for a walk .他每天早上出去散步.When we were children we would go swimming every summer.我们小时候,每年夏天都去游泳.would后跟动词不定式（不带to)的完成式：这一结构表示过去的愿望未能实现.She would have gone with me , but she didn't have time.她本来想和我一起去的,但是她没有时间.I would have rung you up , but I lost your telephone number.我本想给你打电话,但是我把你电话号码弄丢了十.ought详细用法精品讲解ought的用法1.ought to加动词原形,表示有责任,有义务做某事（和should用法差不多,但是语气要稍重些）The students ought to help each other .学生们应该互相帮助You ought not to write so carelessly你不应当写得这样潦草2.表示揣想She ought to be home by now .现在她应该已经到家了.If he started at five , he ought to be here now.如果他五点钟动身,现在他应当到了这儿了.ought跟动词不定式的完成式:这一结构指的是过去的动作1.肯定式（ought to have done):表示某件事情本应该做,而实际却没有做,相当于should have done表达意思.He ought to have seen a doctor .他应该去看医生的（但他没有去看医生）You ought to have returned these books to the library two weeks ago .两星期前你就应该把这些书归还给图书馆.（但实际上你没有去归还图书）2.否定句（ought not to have done )表示：一件事情本不应该发生的却发生了,或者说做了本不该做得事情,相当于should not have done表达意思.You ought not to have taken my dictionary without my permission .你本不应该未经过我许可就拿走我的字典.（不该发生的事情发生了；或者做了不该做得事情.）Children ought not to have drunk wine孩子们本不应该喝酒.（但是孩子们却喝了酒.）十一：need详细用法精品讲解dare的用法1.在否定句和疑问句中：用法和其它情态动词一样,本身无变化,后面跟不带to的动词不定式,No one dare speak of it .没有人敢谈到这件事情.He dare not try他不敢试.Dare you go home alone?你敢独自一个人回家吗?Dare he admit his own mistake?他敢于承认自己的错误吗?2.在肯定句中：dare后可跟带to的动词不定式,这时候,dare和实义动词一样Young people should dare to think, dare to speak and dare to act .年轻人要敢想,敢说,敢干.3.dare做实义动词时用法：它的否定式和疑问句式要用助do来帮助完成,后面动词不定式to可以带I have never dared to tell him about it .我一直不敢把这事情告诉他.The girl did not dare to go home alone .这个女孩不敢独自一个人回家.Do you dare to say so ?你敢这么说吗?十二need详细用法精品讲解need的用法和dare几乎完全相同.1.在否定句和疑问句中：用法和其它情态动词一样,本身无变化,后面跟不带to的动词不定式.We needn't hurry.我们不必赶急Need we hand in exercises today ?我们今天需要交练习吗?2.在肯定句中:need和实义动词一样,后面跟带to的动词不定式,第三人称一般现在式加s,并有时态的变化.Every student needs to be on duty .每个学生都需要值日.3.作实义动词时：它的否定式和疑问式要用助动词来帮助完成,后面的动词不定式可带toDoes he need to know it ?---No, he does need to .他需要知道这事情吗?不,不需要.You don't need to answer the question.你不需要回到这个问题.needn't后跟动词不定式（不带to)的完成式:这一结构指过去已经做了不需要做得事情.You needn't have watered the trees, as it is going to rain你本可以不必浇树,天要下雨了,（浇水这一动作已经发生了）When we reached the airport , the plane had not arrived yet, so we needn't have hurried当我们到达机场时,飞机还没有抵达,所以我们本没有必要匆匆忙忙.（但实际上匆匆忙忙这一动作已经发生了.）英语语法并列句分类讲解一、并列句的构成：并列句是由并列连词and,but,or,for,so等把两个或两个以上互不依从,但意思紧密联系的简单句连在一起而构成的句子.其结构为：简单句+并列连词+简单句.二、并列句的分类：1.表示同等关系的并列句这类并列句常用并列连词and连接前后简单句,and常译为“和”、“并且”,也可不译出来.例如：Jim finished his homework and he went to bed.
吉姆写完作业,就上床睡觉了.Not only I come to school early, but also my teacher does.
不但我到校早,而且我的老师也是如此.keep passing the ball to each other, and you”ll be Ok!If you keep passing the ball each other, you”ll be Ok!Work hard, and you’ll pass the exam. (=If you work hard, you’ll pass the exam.) 努力学习,你就会通过考试. My mother bought me a radio and I liked it very much.母亲给我买了一部收音机,我非常喜欢.He likes playing football and he plays well.他喜欢踢足球,并且踢得很好. Last year l met Kate and we became friends.去年我和凯特相遇,我们成了朋友. He helps me and I help him.他帮我,我帮他.He not only gave us a lot of advice, but also helped us to study English.他不仅给我们出很多建议并且还帮助我学英语.I was just leaving when the telephone rang.我正要离开,电话铃响了.注：when作这种用法时,主要用于was/were doing sth. when sth./sb. was/were about to do sth. when sth./sb. was/were on the point of doing sth. when sth./sb. did等句型中,表示“当某人或某物正在或正要做某事,就在这时突然又发生了另一事”.
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should／ought to＋should／ought to＋have＋过去分词”既可表示本该做而事实上没有做的事,也可以表示惊讶、赞叹等情绪.如：You should have told her about it the day before yesterday． It’s wonderful that you should have achieved so much in these years． “情态动词＋have＋过去分词”是很重要的一种句型,除should外,may,might,must,couldn’t,needn’t,ought to等都可以用于这一句型,但要注意使用不同的情态动词句子的意思就有所不同.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． 简单概括：跟 should的用法一样
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意思是：应该ought后加动词原形
ought to生词本 英 [ɔ:t tu:] 美 [ɔt tu] v. 应当，应该；理应；宜 网络释义 ought to 1. 应该 or else 否则，要不然 ought to 应该 out of breath 上气不接下气 基于210个网页 - 相关网页 2. 应当；应该...
跟 should的用法一样
应当。。。。。ought后面加动词原型。
一、ought to具体用法如下：1. (表示义务、责任等) 应当, 应该You ought to work harder than that.2. (表示劝告、建议等) 应该, 该You don't look well. You ought to go to see the doctor. 3. (表示猜测、期望) 总应该，理应...
应该的意思，后跟动词原型，没有被动语态，相当于should.
ought to基本翻译conj. 应当网络释义ought to:应该|应该, 应当|应当ought to be:应然|应该|什么It ought to be:那一定是|那就这样
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must(should,need, ought to, could might)have done用法比较
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