总计151套试卷 第1/26页
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    四年级知识点总结:英语动词、形容词、名词、副词

      动词:

      1. tell

      2. clean

      3. finish

      4. wash

      5. learn

      6. invent

      7. print

      8. climb

      9. skate

      10. break

      11. cry

      12. practise

      13. win

      14. happen

      15. ride

      形容词:

      1. important

      2. dirty

      3. angry

      4. gold

      5. thirsty

      名词:

      1. dancing

      2. yesterday

      3. National Day

      4. paper

      5. printing

      6. bicycle

      7. the Great Wall

      8. mountain

      9. ice-skating

      10. gold

      11. food

      12. monster

      13. cup

      14. watermelon

      15. knee

      16. finger

      17. matter

      18. medicine

      19. toothache

      20. fever

      副词:

      1. soon

      2. still

      3. also

      4. only

      5. away


    标签:动词、形容词、名词、副词 点击率:316 查看全部
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    初二知识点总结:英语英语主谓一致知识点讲解

      什么是主谓一致?


      句子的主语有单复数及人称的变化,其谓语动词需要根据主语的人称和数的不同而有所变化。即:谓语动词与其主语在人称和数上必须保持一致。


      Her dreams have come true. 她的梦想实现了。


      Her dream has come true. 她的(一个)梦想实现了。


      从以上两个例句可以看出谓语动词随主语的数而变化。


      She/He often arrives school late. 她(他)常常上学迟到。


      They often arrive school late. 他们常常上学迟到。


      You often arrive school late. 你常常上学迟到。


      从以上三个例句可以看出谓语动词随主语的人称变化而变化。


      I am a teacher. 我是老师。


      He/She is a teacher.他(她)是老师。


      从以上例句可以看出谓语动词be随主语的人称变化而变化。


      二、主语与谓语一致所遵循的三个原则


      主语的人称,特别是主语的数是决定谓语形式的关键。除第一人称I和第二人称you之外,单数主语之后的谓语动词用单数形式;复数主语之后的谓语动词用复数形式。主语和谓语动词的一致要遵循下面三个原则:


      1、语法上的一致


      所谓语法一致原则,即主语和谓语的语法形式在人称和数上取得一致。谓语的单、复数形式依据主语的单、复数形式而定:主语为复数,谓语动词用复数;主语为单数或者是不可数名词,谓语动词用单数。


      China belongs to the Third World. 中国属于第三世界。


      使用语法一致的情况


      (1)当主语是and,both…and连接的并列结构


      如果主语指的是两个或两个以上的人或物,则谓语动词用复数。


      My mother and I have seen the film. 我妈妈和我已看过这部电影。


      注意:由and连接的并列主语前面分别有each,every,no修饰时,其谓语动词用单数形式。


      Every boy and every girl has to receive education in our country. 在我国每一个男女孩子都得受教育。


      (2)主语后面接说明主语的修饰语


      主语后面接说明主语的修饰语如 with,along with,together with,as well as,like,rather than,but,except,besides,including,in addition to,谓语动词不受修饰成分的影响,仍保持同主语一致的关系。


      The teacher with two students was at the meeting. 那位老师和两个学生参加了会议。


      (3)非谓语动词或从句作主语


      非谓语动词 (动词的-ing形式、不定式)或从句作主语时,谓语一般用单数形式。


      When and where to build the new factory is not decided yet.什么时候在什么地方建新工厂还没定下来。


      注意:当what引导主语从句或由 and连接两个动词不定式或动名词作主语时,谓语动词的数应根据意义一致的原则来决定。


      (4)each和复合不定代词作主语


      each和some/any/no//every十body/one/thing构成的复合不定代词anyone、anybody、anything、everyone、everybody、everything、someone、somebody、something、no one、nobody、nothing、each、the other作主语,谓语动词用单数。


      Each is worse than the one before. 一个比一个差。


      Nobody knows the answer. 没有一个人知道这答案。


      (5)“many a +单数名词”作主语


      “many a、(很多)/more than one(不只一个)+单数名词”作主语时,谓语动词用单数形式。


      Many a student has been to Beijing. 很多学生去过北京。


      There is more than one answer to your question. 你的问题不只有一个答案。


      (6)“one of+复数名词十定语从句”之前有the等限定词和修饰语


      “one of+复数名词十定语从句”之前有the only,the very,the等限定词和修饰语时,定语从句的谓语动词用单数形式。


      Tom is the only one of those boys who is willing to help the old man. 汤姆是唯一的一个愿意帮助那个老人的男孩。


      He is the only one of the students who has been a winner of scholarship for three years.他是这三年来唯一的一个获得奖学金的学生。


      注意:如没有这些限定词和修饰语,定语从句的谓语动词采用复数形式。


      Tom is one of the boys who are always ready to help others. 汤姆是个随时愿意帮助别人的男孩。


      (7)由两个部分组成的物体名词作主语


      英语中有些由两个部分组成的物体名称如g1asses(眼镜),scissors(剪刀),shorts(短裤),shoes(鞋子),trousers(裤子)等作主语,其后的谓语动词用复数形式。


      His glasses were broken, so he can't see well. 他的眼镜碎了,因而看不清楚。


      His trousers are made of cotton. 他的裤子是棉布的。


      注意:若这类名词前带有pair等表示单位的名词时,则以这些名词的单、复数形式决定动词的形式。


      Two pairs of trousers are missing. 两条裤子不见了。


      This pair of shoes is not on sale. 这双鞋不出售。


      2、意义上的一致


      意义上的一致是指谓语动词与主语的一致取决于主语所表达的意义。若主语形式上为复数,而意义上是单数,动词要用单数;若主语形式上为单数,而意义上为复数,则动词用复数。


      The United States is in North America. 美国在北美洲。


      The police are looking into the matter. 警察正在调查此事。


      使意义上的一致的情况


      (1)由and连接两个并列主语


      其后的谓语动词一般用复数形式。但如果两个单数名词指同一个人、同一事物、单一概念时,谓语动词要用单数,有时两个名词共用一个冠词。


      The worker and writer has written a new novel. 这位工人兼作家写了一部新小说。(两个名词共用一个冠词)


      注意:用and连接起来的两个单数主语,谓语动词可以是单数,也可以是复数。


      (2)形复意单的名词作主语


      ①复数形式的专有名词(表示国家、城市、机构、组织以及书籍、报纸、杂志等)做主语,通常作为整体看待,谓语动词用单数。


      The United States is in North America.美国在北美洲。


      注意:表示山脉、群岛、瀑布等的专有名词和以复数形式出现的表示同姓的一家人或同名、同姓的若干人,谓语也用复数。


      ②以-ics结尾表示学科的名词做主语,通常表示单数意义,谓语动词用单数形式。这类名词有:physics, politics, mathematics, economics, athletics, electronics等。


      Politics is now taught in all schools.现在各学校都开设政治课。


      Economics is a science of the way in which industry and trade produce and use wealth.经济学是研究工业、贸易生财和用财之道。


      注意:当这些动词表示有关方面的活动、情况、见解、原理等意思时,谓语动词需用复数形式。


      What are his politics?他的政见如何?


      The economics of national growth are of the greatest importance to all modern governments.国家发展经济的原理对现代各国政府都重要。


      ③news,maths,plastics,physics,works,means(方法),the United States等虽然以-s结尾,但意义上作为单数看待。


      “News of victories keeps pouring in as our army advances,” the company commander said. 集团军司令说:”随着我们军队的推进胜利的消息接踵而至。”


      ④成对的名词做主语时用单数形式。


      Bread and butter is a daily food in the West .面包抹黄油是西方人每天的食品。


      ⑤“one and a half +复数名词”做主语,谓语动词用单数。


      One and a half pears is left on the table .一只半梨剩在桌子上。


      注意:“one or two+复数名词”做主语,谓语动词用复数。


      One or two days are enough to see the city.参观该市一两天就足够了。


      (3)有生命的集体名词作主语


      有生命的集体名词 (如people,police,cattle,militia)作主语,谓语动词用复数形式。


      Cattle are also kept. 还养了一些牛。


      注意:family,team,class,government,audience,crew,committee等集体名词,如果作整体看待,谓语动词用单数形式;如果作个别成员看待,谓语动词用复数形式。people作“民族”解时,作单数用。


      (4) 名词化的形容词作主语


      名词化的形容词作主语,按照意义一致的原则决定谓语动词的单、复数形式。如果指一类人,谓语动词用复数形式,如果指一个人或抽象概念,谓语动词用单数形式。这类形容词有:old, young, rich, poor, blind, deaf, dead, sick等。


      The rich are not always happy. 富人也有不开心的时候。


      (5) 表示时间、距离、金钱、重量等的复数名词作主语


      表示时间、距离、金钱、重量、度量、容量、温度等的复数名词做主语,通常看作一个整体,谓语动词用单数形式。


      Twenty years has passed since we left school. 我们离开学校已经20年了。


      注意:如果说话人侧重一个个的个体,谓语动词用复数形式。


      (6)“a number of十复数可数名词”与“the number of十复数可数名词”作主语


      “a number of十复数可数名词”表示 “一些、许多”的意思,谓语动词用复数;“the number of十复数可数名词”表示 “……的数目、数量”,谓语动词用单数。


      (7)none of和neither of后跟复数名词或复数代词作主语


      none of和neither of后跟复数名词或复数代词时,有时作单数看待,有时作复数看待,主要根据说话人的意思决定。


      None of them have arrived yet. 他们都还没到。


      (8)“分数/百分数+of短语”作主语


      “分数/百分数+of短语”作主语,这时要以of短语中的名词是否为复数而定。


      Two fifths of the land in that district is covered with trees and grass.该地区五分之二的土地为树木和草所覆盖。


      89% of smokers are male. 89%的吸烟者是男性。


      (9)表示部分概念或不定数量的名词或代词作主语


      表示部分概念或不定数量的名词或代词作主语,谓语动词用单数还是复数,应根据后接名词的单、复数形式而定。这些名间或代词有all,any,enough,half,more,most,the rest,part,some等。


      The rest of the buildings are easy to get to. 其余的建筑物并不难上。


      (10)两个主语,一个肯定,一个否定,谓语动词与肯定主语相一致。


      The parents, and not the son, were missing.失踪者不是儿子,而是他的双亲。


      3、邻近原则


      邻近原则是指谓语动词要与它最邻近的名词或代词保持人称与数的一致。


      Neither he nor I am a student. 他和我都不是学生。


      There is a pen , two chairs and a desk. 有一支钢笔,两把椅子和一张桌子。


      这主要有以下几种情况。


      (1)由or,either…or等连接的并列结构作主语


      由or、either…or、nor、neither…nor、not only…but also、not…but连接的并列主语,通常按照就近一致原则,谓语动词的单、复数形式依照靠近它的主语而定。


      Either you or the headmaster is to hand out the prizes to these gifted students at the meeting.要么你要么校长在会议上对这些天才的学生颁奖。


      (2)在主谓倒装句时


      在主谓倒装句中,主语并列,谓语动词的人称和数与最近的主语相一致。由here或there引导的句子,若有并列主语,谓语也与最靠近的那个主语一致。


      There is a desk, a table and three chairs in the room. 房间里有一张书桌、一张饭桌和3把椅子。


      主谓一致口诀巧记:


      单单复复最常见,集体名词谓用单,如若强调其成员,复数谓语记心间。


      有些名词谓常复,people,police即这般。主语单数后接介,谓语单数介无关,


      many a作主语也如此,谓语动词应用单。or、nor、but also、there be,近主原则挂嘴边。


      关系代词定主语,谓语根据先行词判。不定式短语、动名词,主语从句谓全单。


      时间、货币与距离,谓语多单复少见,rest,means,fol1owing等,意义决定其复、单。


      none,all,half of等,of之宾语定答案。还有分数、百分数,仍据of之宾定复、单。


      代词all指人谓复数,all指事情谓用单。量词用法请注意,谓语要随量词变。


      and连接两名词,身兼两职一定冠,no,each,every后单名,两件(种)事(物)系一概念,


      以上情况请记清,谓语动词全用单。形容词带the一类人,姓氏复数加定冠,


      -s结尾的海峡、山脉与群岛,谓语用复勿用单。neither,either,each,用作主语谓全单。


    标签:主谓一致,英语主谓一致,主谓一致讲解 点击率:594 查看全部
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    初一知识点总结:英语形容词比较级变化规则

      什么是形容词的比较级?


      当两种物体之间相互比较时,我们要用形容词或副词的比较级;


      当相互比较的物体是三个或三个以上时,我们就要用形容词或副词的最高级。


      形容词的比较级和最高级的特殊变化规则:


      一、少数单音节词前面加 more-, most- 构成比较级和最高级


      tired ---- more tired , most tired


      fond ----- more fond , most fond


      glad ----- more glad , most glad


      bored ---- more bored , most bored


      pleased---- more pleased , most pleased


      二、不规则变化


      good /well------- better ,best


      bad/badly/ill------ worse , worst


      many/much-------more , most


      little ------ less , least


      far ---- farther, farthes / firther , furthest


      old ---- older , oldest (GA)


      ---- older , oldest / elder , eldest (GB)


      三、下列形容词和副词的比较级和最高级有两种形式


      cruel----- crueler, cruelest /more cruel , most cruel


      strict---- stricter , strictest /more strict , most strict


      often----- oftener , oftenest / more often , most often


      friendly------ friendlier , friendliest / more friendly , most friendly


      clever----- cleverer, cleverest / more clever , most clever


      四、下列形容词和副词没有比较级和最高(即表示”最高程度”或”绝对状态”的形容词和副词没有比较级和最高级)


      empty , wrong , perfect , unique , extreme , excellent , favourite (GB)/ favorite (GA) , true , right , correct , extremely


    标签:形容词比较级,形容词比较级变化规则 点击率:565 查看全部
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    六年级知识点总结:英语英语倒装句知识点用法讲解

      倒装是一种语法手段,用于表示一定的句子结构或强调某一句子成分。倒装句有两种:完全倒装和部分倒装。


      1. 倒装句之全部倒装


      全部倒装是只将句子中的谓语动词全部置于主语之前。此结构通常只用与一般现在时和一般过去时。常见结构:


      1) here, there, now, then, thus等副词置于句首, 谓语动词常用be, come, go, lie, run。


      There goes the bell.


      Then came the chairman.


      Here is your letter.


      2) 表示运动方向的副词或地点状语置于句首,谓语表示运动的动词。


      Out rushed a missile from under the bomber.


      Ahead sat an old woman.


      注意:上述全部倒装的句型结构的主语必须是名词,如果主语是人称代词则不能完全倒装。


      Here he comes.   Away they went.


      2. 倒装句之部分倒装


      部分倒装是指将谓语的一部分如助动词或情态倒装至主语之前。如果句中的谓语没有助动词或情态动词,则需添加助动词do, does或did,并将其置于主语之前。


      1) 句首为否定或半否定的词语,如no, not, never, seldom, little, hardly, at no time, in no way, not until… 等。


      Never have I seen such a performance.


      Nowhere will you find the answer to this question.


      Not until the child fell asleep did the mother leave the room.


      当Not until引出主从复合句,主句倒装,从句不倒装。


      注意: 如否定词不在句首不倒装。


      I have never seen such a performance.


      The mother didn't leave the room until the child fell asleep.


      典型例题 1) ---Why can't I smoke here?   ---At no time___ in the meeting-room.


      A. is smoking permitted  B. smoking is permitted C. smoking is it permitted D. does smoking permit


      答案A. 这是一个倒装问题。当否定词语置于句首以表示强调时,其句中的主谓须用倒装结构。 这些否定词包括no, little, hardly, seldom, never, notonly, not until等。本题的正常语序是 Smoking is permitted in the meeting-room at no time.


      2) Not until the early years of the 19th century ___ what heat is.


      A. man did know  B. man know  C. didn't man know  D. did man know


      答案D.  看到Not until…的句型,我们知道为一倒装句,答案在C,D 中选一个。


      改写为正常语序为,Man did not know what heat is until the early years of the 19th. 现在将not提前,后面就不能再用否定了,否则意思就变了。


      3. 以否定词开头作部分倒装


      如 Not only…but also, Hardly/Scarcely…when, No sooner… than


      Not only did he refuse the gift, he also severely criticized the sender.


      Hardly had she gone out when a student came to visit her.


      No sooner had she gone out than a student came to visit her.


      典型例题: No sooner___ than it began to rain heavily.


      A. the game began    B. has the game begun C. did the game begin    D. had the game begun


      答案D. 以具有否定意义的副词放在句首时,一般采用倒装句(谓语前置)。这类表示否定意义的词有never, seldom, scarcely, little, few, not, hardly, 以及not only…but (also), no sooner…than, hardly… when scarcely… when 等等。


      注意:只有当Not only… but also连接两个分句时,才在第一个分句用倒装结构。如果置于句首的Not only… but also仅连接两个并列词语,不可用倒装结构。


      Not only you but also I am fond of music.


      4. so, neither, nor作部分倒装   表示"也"、"也不" 的句子要部分倒装。


      Tom can speak French. So can Jack.


      If you won't go, neither will I.


      典型例题: ---Do you know Jim quarrelled with his brother?  ---I don't know, _____.


      A. nor don't I care  B. nor do I care  C. I don't care neither  D. I don't care also


      答案:B. nor为增补意思"也不关心",因此句子应倒装。A错在用 don't 再次否定, C. neither 用法不对且缺乏连词。 D缺乏连词。


      注意: 当so引出的句子用以对上文内容加以证实或肯定时,不可用倒装结构。意为"的确如此"。


      Tom asked me to go to play football and so I did.


      ---It's raining hard.   ---So it is.


      5. only在句首要倒装的情况


      Only in this way, can you learn English well.


      Only after being asked three times did he come to the meeting.


      如果句子为主从复合句,则主句倒装,从句不倒装


      Only when he is seriously ill, does he ever stay in bed.


      6. as, though 引导的倒装句


      as / though引导的让步从句必须将表语或状语提前 (形容词, 副词, 分词, 实义动词提前)。


      注意:1) 句首名词不能带任何冠词。


      2) 句首是实义动词, 其他助动词放在主语后。如果实义动词有宾语和状语, 随实义动词一起放在主语之前


      Try hard as he will, he never seems able to do the work satisfactorily.


      注意: 让步状语从句中,有though,although时,后面的主句不能有but,但是 though 和yet可连用。


      7. 其他部分倒装


      1)  so… that 句型中的so 位于句首时,需倒装。 So frightened was he that he did not dare to move an inch.


      2) 在某些表示祝愿的句型中:  May you all be happy.


      3) 在虚拟语气条件句中从句谓语动词有were, had, should等词,可将if 省略,把 were, had, should 移到主语之前,采取部分倒装。 Were I you, I would try it again.


    标签:英语倒装句,倒装句讲解,倒装句知识点 点击率:502 查看全部
  • 0

    六年级知识点总结:英语there be句型的用法及讲解

      There be句型是一种应用十分广泛和频繁的句型,主要用来表达“某处有某人、某事、某物'',有时也用来强调。


      由there + be + 主语 + 状语 构成,用以表达存在有,一种无主语的有。 它其实是倒装的一种情况,主语位于谓语动词 be 之后,there 仅为引导词,并无实际语。Be与其后的主语在人称和数量上一致,有时态和情态变化。


      There be句型的用法及讲解


      1. 主谓一致,就近原则


      eg. Are there students in the reading classroom?


      阅览室里有学生吗?


      There is writing desk,a computer,and piles of books in the room.


      屋子里有一张写字台,一台计算机和几堆书。


      2. There be 句型出来用be,还可用seem,appear,exist,stand,lie,run,remain etc.


      eg. There appears to be lots of misunderstanding between us.


      我们之间有很多误会。


      There once lived two gods who were in charge of Earth and Heaven.


      曾经有两个神,他们分别住在地和天。


      There lies a large field of rice in front of our village.


      在我们的村庄前面有一大片稻田。


      There remains several questions still to be answered.


      3.There be 句型中的be根据具体要求有多种动词形式:


      There is going to be ...表将来


      There have been ...表现在完成


      There must be ... 肯定有


      There ought to be ...应该有


      4. There be 句型中如果地点状语放句首,there有时也可省略


      On the top of the desk (there)are piles of books.桌子上有几堆书。


      From behind the door (there) are rushed out a white and black dog.


      从门后跑出来一条黑白相间的狗。


    标签:there be句型,there be句型的用法,there be句型讲解 点击率:627 查看全部
  • 0

    五年级知识点总结:英语情态动词知识点总结

      情态动词有哪些?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 the oil ought to/should be.(含蓄)


      八、 情态动词+不定式完成式(have done)


      1) can / could + have done在肯定句中表示“本来可以做而实际上能做某事”,是虚拟语气;在疑问句或否定句中表示对过去行为的怀疑或不肯定, 表示推测。


      1. You could have done better, but you didn’t try your best. (虚拟语气)


      2. He can’t have been to that town.(推测)


      3. Can he have got the book?(推测)


      2) may / might +不定式完成式(have done)


      表示对过去行为的推测。不能用于疑问句中,没有虚拟语气的用法。Might所表示的可能性比may小。


      1. He may not have finished the work .


      2. If we had taken the other road, we might have arrived earlier.


      3)must +不定式完成式(have done)


      用于肯定句中,表示对过去行为的推测。意为“一定、想必”。其疑问、否定形式用can,can’t代替。参看1) can / could + have done表示推测。


      1. You must have seen the film Titanic.


      2. He must have been to Shanghai.


      4)should +不定式完成式(have done)


      用于肯定句中,表示对过去行为的推测。


      He should have finished the work by now。


      表示“本应该做而实际上没有做某事”,其否定式表示某种行为本不该发生却发生了。可以与ought to +不定式完成式(have done)互换。


      1. You ought to / should have helped him. (but you didn’t.)


      2. She shouldn’t have taken away my measuring tape, for I wanted to use it.


      5) needn’t +不定式完成式(have done)


      表示“本来不必做而实际上做了某事”。


      You needn’t have watered the flowers, for it is going to rain.


      6) will +不定式完成式(have done)


      主要用于第二、三人称,表示对已完成的动作或事态的推测。


      He will have arrived by now.


    标签:情态动词,情态动词知识点总结 点击率:389 查看全部