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英语必修四Unit2

英语必修四Unit2
英语必修四Unit2

必修四unit2重要知识点

1)hunger 名词,表示“饥饿,欲望”。

have a hunger for sth渴望做某事。

satisfied one’s hunger解饿。

作动词,表示“(使)饥饿”。

hunger for/after表示“渴望得到”。

2)thanks to 表示“由于”。

区别thanks to,due to和owing to:

thanks to相当于on account of;because of ,多用于褒义。

owing to表示“因为”,只能作状语。

due to也表示“因为”,可作状语,可放在be后面,也可直接用在名词后面。

3)freedom

freedom of;freedom to do…表示“……的自由”。

freedom from…不受……的影响。

the freedom of sth随意使用某物的权利。

4)would rather 表示“宁愿,宁可”后接动词原形。

would rather do…than do…表示“宁愿做……而不愿做……”。

would rather后接省略that的宾语从句,从句的谓语动词要用虚拟语气。用过去式表示现在或将来,用过去完成式表示过去。

5)suitable形容词“合适的,适当的”。

be suitable for/to sb/sth适合于……。

6)term 名词,表示“术语,期限,学期”。

带有term的短语:

holiday terms冠冕堂皇的言语,奉承的言语serve one’s term服刑in good set terms用坚决严肃的语言in the long(short)term从长远(短期)来说in terms of用……的字眼,从……观点出发;换算,折合

7)refer to向某人/某事物查询信息。提到,说到,涉及到。与某人有关。适用于。

8)reduce 表示“减少,缩减,缩小,降低,简化”。

reduce…to减少到……;使陷入……的境遇;使成为……的情况;使变形,使变化;分解,化简。归纳成为。

reduce…by减少了……。

9)supply

作动词,表示“补给,供给,提供”。supply sb with sth=supply sth to/for sb。

作名词,表示“供给,供应”,是不可数名词。表示“供应品,补给品”,是可数名词,常用复数形式。

in short supply缺少,供应不足。

have a large/good supply of… = have large supplies of… 备有许多……。

10)whatever

作连接代词,表示“无论什么,凡是……”,引导让步状语从句。相当于no matter what…也可以引导名词性从句。

作疑问代词,意思是“(究竟是)什么”。or whatever诸如此类。作副词,常用于no+名词,nothing,none等之后,以加强语气。

11)summary表示“总结,归纳,摘要”。

in summary总的来说。作形容词,表示“简短的,迅速的,概括的”。

12)rid rid sb of sth除掉某人的……。get rid of意思是“除掉,除去,摆脱”。

13)regret 作动词,表示“后悔,懊恼,惋惜”。作名词,表示“懊恼,遗憾,悔恨”。regret sth/that…后悔某事。

regret doing sth后悔干了某事。

regret to do sth遗憾要干某事。

It is to be regretted that…遗憾的是……。

to one’s re gret 抱歉,令某人遗憾的是。

14 be satisfied (with) 对……感到满意

Households may not be satisfied with a 500% buffer.但是房主们应该不满意500%的缓冲准备。If you are not completely satisfied, you can get your money back.

15. lead a ...life: 过着……的生活

If the operation succeeds, the patient will be able to lead a normal life.

Mrs. Black is retired and leads a quiet and peaceful life in a mountain village.

16. insist on sth/doing sth: 坚持做某事

The school insists on good behaviour from its students.

John insisted on doing all the work himself, though he was in poor health.

3.语法——动名词作主语宾语与动词不定式

定义动名词是一种兼有动词和名词特征的非限定动词。它可以支配宾语,也能被副词修饰。动名词有时态和语态的变化。解释:动词的ing形式如果是名词,这个词称动名词。

特征:动词原形+ing构成,具有名词,动词一些特征

一、动名词的作用

动名词具有名词的性质,因此在句中可以作主语、表语、宾语、定语等。

1、作主语有时先用it作形式主语,把动名词置于句末。这种用法在习惯句型中常用。动名词作主语的几种类型

动名词可以在句子中充当名词所能充当的多种句子成分。在这里仅就动名词在句子中作主语的情况进行讨论。

动名词作主语有如下几种常见情况:

1. 直接位于句首做主语。

2. 用it 作形式主语,把动名词(真实主语)置于句尾作后置主语。

动名词做主语时,不太常用it 作先行主语,多见于某些形容词及名词之后。

常见的能用于这种结构的形容词还有:better,wonderful,enjoyable,interesting,foolish,difficult,useless,senseless,worthwhile,等。

注意:important,essential,necessary 等形容词不能用于上述结构。

3. 用于“There be”结构中。

4. 用于布告形式的省略结构中。

5. 动名词的复合结构作主当动名词有自己的逻辑主语时,常可以在前面加上一个名词或代词的所有格,构成动名词的复合结构(——这时,名词或代词的所有格做动名词的逻辑主语)。动名词的复合结构也可以在句中作主语。

二、动名词作主语与动词不定式作主语的比较

动词不定式和动名词都可以用作主语。在意义上相近。但动名词多用来表示泛指或抽象动作,不定式多用来表示特指或具体动作。

注意:1)在口语中,用动名词作主语位于句首的较不定式多见。2)在“It is no use…”,“It is no good…”,“It is fun…”,“It is a waste of time…”等句型中,通常用动名词作真实主语。

3)在疑问句中,通常用动名词的复合结构,而不用不定式的复合结构作主语。

4)在“There be”句型中,只能用动名词,而不能用不定式作主语。

5)当句子中的主语和表语都是非限定动词时,要遵循前后一致的原则,主语和表语在形式上要求统一。

2、作宾语

(1)作动词的宾语

某些动词后出现非限定性动词时只能用动名词作宾语,不能用不定式。常见的此类动词有:advise, allow, permit, avoid, consider, enjoy, finish, give up, cannot help, imagine, include, keep, keep on, mind, miss, put off, delay, practise, resist, suggest, depend on, think about, set about, succeed in, worry about, burst out, insist on, can’t stand, be used to, get used to, devo…to…, look forward to, pay attention to, get down to等。

(2)作介词的宾语。

(3)作形容词的宾语。

3、作表语动名词作表语时句子主语常是表示无生命的事物的名词或what引导的名词性从句。表语动名词与主语通常是对等的关系,表示主语的内容,主语、表语可互换位置。

4、作定语动名词作定语往往表示被修饰词的某种用途。

二、动名词的逻辑主语

带有逻辑主语的动名词称为动名词的复合结构。当动名词的逻辑主语与句子的主语不一致时,要在动名词之前加上物主代词或名词所有格,这便构成了动名词的复合结构。其中物主代词(名词所有格)是逻辑上的主语,动名词是逻辑上的谓语。动名词复合结构在句中可作主语、宾语、表语等,分别相当于一个主语从句、宾语从句、表语从句。如

在口语中,如果动名词复合结构作宾语,其中的物主代词常用人称代词宾格,名词所有格常用名词普通格来代替,但在句首作主语时不能这样来代替。

在下列情况下动名词的逻辑主语必须用名词的普通格或人称代词宾语:

a.无命名词

b. 有生命名词但表示泛指意义

c. 两个以上的有生命名词并列

三、动名词的时态和语态

1、动名词一般式表示的动作通常是一般性动作,即不是明确地发生在过去、现在或将来的动作,或是与谓语动词所表示的动作同时发生的动作。

2、动名词的完成式表示的动作发生在谓语动词动作之前。

3、动名词的逻辑主语同时也是动名词动作的承受者,动名词用被动语态。

(1)它的一般式表示的动作与谓语动词动作同时发生,或在其前发生。

(2)它的完成式表示的动作发生在谓语动词之前。

(3)在某些动词,我们常用动名词的一般式表示完成式,尽管动作发生在谓语动词动作之前,这似乎是一种强大的习惯。

(4)在多数情况下都避免使用动名词被动语态完成式,而用一般式代替,以免句子显得累赘,尤其是在口语中。

(5)动名词被动语态一般式与现在分词被动语态一般式同形,但无进行意义,being不可省

略。

四、常见题型:

1)动名词做主语时,谓语动词为单数。

2)在动名词和不定式中,作为介词的宾语是动名词。

3)动名词的否定直接在其前加否定词,通过代词的宾格或所有格形式给出逻辑主语。

4)有些词后只能接动名词

admit; appreciate; avoid; celebrate; consider; contemplate; defer; delay; deny; detest; discontinue; dislike; dispute; enjoy; it entails; escape; excuse; explain; fancy; feel like; finish; forgive; can’t help; hinder; imagine; it involves; keep; it means; mention; mind; miss; it necessitates; pardon; postpone; practice; prevent; recall; report; resent; resist; risk; suggest; understand…

5)另外还有一些接-ing形式的常用说法

it’s no good; it’s no/little/hardly any/ use; it’s not/hardly/scarcely use; it’s worthwhile; spend money/time; there’s no; there’s no point in; there’s nothing worse than; what’s the use/point…

6)有些词后面加不定式和动名词均可

remember, forget, try, stop, go on, cease, mean后面均可用不定式和-ing形式,但意义截然不容。

五、动名词与现在分词的同与不同

动名词它在形式上与现在分词相同,都是在动词原形的词末加-ing。在现代语法中,这两种形式同视为“-ing形式”。这两种形式的另一个相同之处是:它们都是由动词变化而成的,它们都保留了动词的某些特征,它们都能带自己的宾语、状语,而构成动名词短语或是现在分词短语去担当句子成分。

区别:

1?动名词和现在分词都可以用于系动词之后作表语,区别方法是:

①作表语的动名词与主语指的是同一件事,此时系动词相当于“是”,通常把主语和表语的位置互换,语法和意思不变。②现在分词作表语主要用以说明主语的性质,不能与主语互换位置。2动名词和现在分词都可以用作定语来修饰名词,两者的区别在于:

动名词修饰名词时主要表示该名词的用途,而现在分词修饰名词时性质?状态或动作等。

被动语态

一、被动语态的用法:

1. 一般现在时的被动语态构成:is / am / are + 及物动词的过去分词。

2. 一般过去时的被动语态构成:was / were + 及物动词的过去分词。

3. 现在完成时的被动语态构成:has / have + been + 及物动词的过去分词。

4. 一般将来时的被动语态构成:will+ be + 及物动词的过去分词。

5. 含有情态动词的被动语态构成:情态动词+ be + 及物动词的过去分词。

6. 现在进行时的被动语态构成:am / is / are + being + 及物动词的过去分词。

7. 不定式的被动语态:to + be + 及物动词的过去分词。

二、怎样把主动语态改成被动语态?

把主动语态改为被动语态非常简单,可以遵循以下几个步骤:

1. 先找出谓语动词;

2. 再找出谓语动词后的宾语

3. 把宾语用作被动语态中的主语;

4. 注意人称、时态和数的变化。

三、使用被动语态应注意的几个问题:

1. 不及物动词无被动语态。

2. 有些动词用主动形式表示被动意义。

3. 感官动词或使役动词使用省略to的动词不定式,主动语态中不带to ,但变为被动语态时,须加上to 。

4. 如果是接双宾语的动词改为被动语态时,直接宾语(物)作主语,那么动词后要用介词,这个介词是由与其搭配的动词决定,或是间接宾语加被动语态再加只接宾语。

5. 一些动词短

语用于被动语态时,动词短语应当看作一个整体,而不能丢掉其中的介词或副词。

不定式

[不定式的简介]

1. 不定式定义:由to+动词原形构成。

不定式是一种非限定性动词。而非限定动词是指那些在句中不能单独充当谓语的动词,可分为不定式,动名词,现在分词和过去分词。

2.用途:在句中不能作谓语。它具有动词的性质,本身可以带宾语和状语。

[动词不定式的时态、语态]

动词不定式可以作以上各种成分,但它毕竟是动词,所以有动词的属性

动词不定式及其短语还可以有自己的宾语、状语,虽然动词不定式在语法上没有表面上的直接主语,但它表达的意义是动作,这一动作一定由使动者发出。这一使动者我们称之为逻辑主语,其形式如下:

主动形式被动形式

一般式(not) to make (not) to be made完成式(not) to have made ( not) to have been made 进行式(not) to be making (not)to have been making

(1)语态如果动词不定式的逻辑主语是这个不定式所表示的动作的承受者,不定式一般要用被动语态形式。

在There be结构中,修饰主语的不定式可用被动,也可用主动。如:There are still many things to t ake care of (to be taken care of).但有时两种形式表达的意思不同,如:These is nothing to do now.( We have nothing to do now.) There is nothing to be done now.(We can do nothing now.) (2)时态

1) 现在时:一般现在时表示的动词,有时与谓语动词表示的动作同时发生,有时发生在谓语动词的动作之后。

2) 完成时:表示的动作发生在谓语动词表示的动作之前。

3) 进行时:表示动作正在进行,与谓语动词表示的动作同时发生。4) 完成进行时:[疑问词+不定式结构]

疑问词who,what,which,when,where,whether,how后可接不定式构成不定式短语,在句中作主语、宾语、表语等。

疑问词+不定式部分,均可转换为相应的从句形式。经常在这种结构中使用的动词有:consider,decide,discover,explain,find out,forget,hear,know,lea rn,observe,understand,wonder等。[动词不定式的语法功能]

一、作主语

动词不定式作主语时,句子的谓语动词常用单数,其位置有以下两种:

(1)把不定式置于句首

(2)用it作形式主语,把真正的主语不定式置于句后,常用于下列句式中。如:

①It+be+名词+to do ②It takes sb+some time+to do

③It+be+形容词+for sb+to do ④It+be+形容词+of sb+to do

⑤It seems(appears)+形容词+to do

在句型③中,常用表示客观情况的形容词,如:difficult,easy,hard,important,impossible,necessary 等;在句型④中,常用careless,clever,good,foolish,honest,kind,lazy,nice,right,silly,stupid,wise 等表示赞扬或批评的词。在不定式前的sb,可看作其逻辑主语。这一句式有时相当于Sb is +形容词+to do句式。

二、作宾语

1) 动词+ 不定式

https://www.wendangku.net/doc/ab3997722.html,e.dare.demand..determine. expect.elect.endeavor.hope.fail.happen.help.hesitate.learn.long.mean.manage.offer.ought.plan.prep are.pretend.promise.refuse.seem.tend.wait.wish.undertake. desire

2)动词+不定式;动词+宾语+不定式

ask, beg, choose, expect , hate, help intend like, love, need prefer, prepare, promise, wan t, wish…3)动词+疑问词+ to

decide, know, consider forget, learn, remember, show, understand, see, wonder, hear, find out, explain, tell

4)以下动词后,只能跟不定式作宾语。

5)当复合宾语中的宾语是不定式时,先用形式宾语it代替不定式,把不定式置于补语之后,即:主语+动词+it+补语+to do句式。

三、作补语

1) 动词+宾语+不定式(to do)

https://www.wendangku.net/doc/ab3997722.html,mand compel consider declare drive enable encourage find forbid force guess hire imagine impel induce inform instruct invite judge know like order permit persuade remind report request require select send state suppose tell think train trust understand urge warn Find 的特殊用法:

Find 后可用分词做宾补,或先加形式宾语,再加形容词,最后加带to 的动词不定式。find 后也可带一个从句。此类动词还有get,have。

2) to + be 的不定式结构,作补语的动词。

Acknowledge,believe,consider,think,declare(声称),discover, fancy(设想),feel find,guess, judge,imagine,know,prove,see(理解), show,suppose,take(以为),understand

3) to be +形容词

Seem,appear,be said,be supposed,be believed,be thought,be known,be reported, hope, wish,desire,want,plan,expect,mean…

4)there be+不定式

believe, expect, intend, like, love, mean, prefer, want, wish, undrstand

有些动词需用as 短语做补语,如regard, think believe, take, consider.

四、作表语

不定式作表语表示具体动作或将来动作;动名词作表语表示抽象的一般行为。

当主语和表语都是不定式时,其含义一是条件,一是结果。当主语是aim,duty,hope,idea,mista ke,plan,purpose,suggestion等为中心词的名词词组时,或以what引导的名词性分句,不定式说明主语的内容。

动名词作表语,与主语部分可以转换,另外,动名词作表语还应与进行时态区别开来。五、作状语

1)目的状语

to…only to (仅仅为了),in order to,so as to,so(such)…as to… (如此……以便……)

2)作结果状语,表事先没有预料到的,要放在句子后面。

3)表原因

六、作定语

⒈不定式作定语

不定式在句中作定语,置于被修饰的名词或代词之后。

不定式短语作定语和被修饰词之间表示以下关系:

(1)表示将来的动作。

(2)与被修饰词之间有动宾关系,如是不及物动词,则需加介词。

(3)与被修饰词之间有动宾关系,同时与句中其它词之间又有逻辑上的主谓关系时,尽管有被动含义,却仍用主动语态;如只有动宾关系,而无逻辑上的主谓关系,则需用被动语态。

(4)不定式作定语时,一般可转换为定语从句。

[省to 的动词不定式]

1)情态动词( 除ought 外,ought to):2)使役动词let, have, make:

3)感官动词see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作宾补,省略to。注意:在被动语态中则to 不能省掉。

4)表示个人意愿或倾向的would rather,had better,might(just) as well:rather than置于句首时。5)Why… / why not…:

6)help 可带to,也可不带to, help sb (to) do sth:

7)but和except:but前是动词do时,后面出现的动词用不带to的动词不定式。

8)由and, or和than连接的两个不定式,第二个to 可以省去:

9)通常在discover, imagine, suppose, think, understand等词后,可以省去to be:

10)but作介词,后接不定式结构时,前面谓语动词部分若含有do的形式时,but后的不定式要省去to,否则要带to。

11)当两个或多个不定时短语由连词and,but或or连接时,后一个或几个不定式符号to常省略。但若表示对比、对照关系时,则不能省略。

12)不定式做表语时,一般要带to,但若主语部分中含有do的各种形式时,符号to可省去。[不定式的特殊句型]

1、不定式的特殊句型so as to

1)表示目的;它的否定式是so as not to do。

2)so kind as to —劳驾

2、“Why not +动词原形”表达向某人提出建议

“为什么不……?” “干吗不……?”

3、It’s for sb.和It’s of sb.

1)for sb. 常用于表示事物的特征特点,表示客观形式的形容词,如easy, hard, difficult, interesting, impossible等:

2)of sb的句型一般用表示人物的性格,品德,表示主观感情或态度的形容词,如good, kind, nice, clever, foolish, right。

for 与of 的辨别方法:

用介词后面的代词作主语,用介词前边的形容词作表语,造个句子。如果道理上通顺用of,不通则用for。

4、不定式的特殊句型too…to… 1)too…to太……以至于……

2) 如在too前有否定词,则整个句子用否定词表达肯定,too 后那个词表达一种委婉含义,意为“不太”。3)当too 前面有only, all, but时,意思是:非常…等于very。

一为不定式+动词原形;

一为介词+名词/动名词, to 在下面的用法中是第二种,即to+ 名词/动名词:

admit to承认,confess to承认,be accustomed to 习惯于,be used to 习惯于,stick to 坚持,turn to开始,着手于,devote oneself to 献身于,be devoted to 致力于,look forward to 盼望,pay attention to 注意

介词but,except,besides+to do(do)

在这种句型中,如介词前有动词do,后面应接不带to的不定式;如无do,则接to不定式,

即带do不带to,带to不带do。

[动词不定式与动名词区别与联系]

1)动名词与不定式的区别:

动名词表达的是:状态,性质,心境,抽象,经常性,已发生的不定式表达的是:目的,结果,原因,具体,一次性,将发生的。

2)接不定式或动名词,意义相同。3)在下列情况下,一般要用不定式:

①hate,like,love前有would(should)时。②当谓语动词begin,continue,start等是进行式时。

③begin,continue,start与know,understand等状态动词连用时。

④advise,allow,encourage,forbid,permit等动词后接动名词作宾语,或带不定式作宾语补足语。4)部分动词后接不定式或动名词时,意义差别较大,应根据句子语境选择使用。

①forget,remember,regret后接不定式,表示现在或未来的动作,接动名词表示动作已经发生。动名词与不定式语义不同的有11 组:

1stop to do stop doing

2 forget to do forget doing

3remember to do remember doing

4 regret to do regret doing

5cease to do cease doing

6 try to do try doing

7go on to do go on doing

8 afraid to do afraid doing

9interested to do interested doing

10 mean to do mean doing

11 begin/ start to do begin/ start doing

1 forget doing/to do

forget to do忘记要去做某事。(未做)

forget doing忘记做过某事。(已做)

2 stop doing/to do

stop to do停止,中断做某事后去做另一件事。

stop doing停止做某事。

3 remember doing/to do

remember to do 记得去做某事(未做)

remember doing记得做过某事(已做)

4 regret doing/to do

regret to do对要做的事遗憾。(未做)

regret doing对做过的事遗憾、后悔。(已做)

5 cease doing/to do

cease to do长时间,甚至永远停做某事。

cease doing短时停止做某事,以后还会接着做。

6 try doing/to do

try to do努力,企图做某事。

try doing试验,试着做某事。

7 go on doing/to do

go on to do做了一件事后,接着做另一件事。

go on doing继续做原来做的事。

8 be afraid doing/to do

be afraid to do不敢,胆怯去做某事,是主观上的原因不去做,意为”怕”;

be afraid of doing担心出现doing的状况、结果。doing 是客观上造成的,意为”生怕,恐怕”。

9 be interested doing/to do

interested to do对做某事感兴趣,想了解某事。

interested in doing对某种想法感兴趣,doing 通常为想法。

10 mean to doing/to do

mean to do打算、想

mean doing意味着

11 begin(start) doing/to do

begin / start to do sth

begin / start doing sth.

1)谈及一项长期活动或开始一种习惯时,使用doing。

2)begin, start用进行时时,后面动词用不定式to do。

3)在attempt, intend, begin, start 后接know, understand, realize这类动词时,常用不定式to do。

4)物作主语时用to do。

⒉动词不定式的时态,语态

(1)时态

①一般式:动词不定式一般式表示的动作发生在谓语动词之后,有时表示同时发生。

②完成式:表示的动作发生在谓语动词所表示的动作之前。

③进行式:表示的动作与谓语动词同时发生。

(2)语态如果动词不定式的逻辑主语是这个不定式所表示的动作的承受者,不定式一般要用被动语态形式。

在There be结构中,修饰主语的不定式可用被动,也可用主动.如:There are still many things to take care of (to be taken care of).但有时两种形式表达的意思不同,如:These is nothing to do now.( We have nothing to do now.) There is nothing to be done now.(We can do nothing now.)

⒊动名词的时态,语态

(1)时态

①一般式:动名词的一般式所表示的动作可以是泛指,也可与谓语动词同时发生,或发生在谓语动作之前,之后。

②完成式所表示的动作发生在谓语动词之前。

(2)被动语态

①如果动名词的逻辑主语为动名词所表示的动作的承受者,动名词要用被动语态,动名词的被动语态有一般式与完成式之分。

②有些动词后的动名词用主动形式,但表示被动意义。

⒋在口语中,为避免重复,常用”to”代替不定式结构,有时甚至可以把to省略。

⒌在why引起的问句中,省略”to”.如:Why spend such a lot of money Why not wait for a couple of days

⒍当两个或更多作用相同的不定式并列使用时,只在第一个不定式前加”to”。

⒎”to”在下列短语中是”介词”,后接动名词或名词形式。

devote…to, face up to(勇敢地面对),look forward to(盼望),object to(反对),take to(养成习惯,对……感兴趣;开始从事某种活动),be used to(习惯于)等。

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