學(xué)習(xí)任何一門科目都離不開對(duì)的知識(shí)點(diǎn),尤其是同學(xué)們?cè)趯W(xué)習(xí)英語(yǔ)時(shí),更要總結(jié)各個(gè)語(yǔ)法知識(shí)點(diǎn),這樣也方便同學(xué)們?nèi)蘸蟮膹?fù)習(xí)。下面小編為大家?guī)?lái)高三英語(yǔ)語(yǔ)法必背知識(shí)點(diǎn)，希望對(duì)您有所幫助!

高三英語(yǔ)語(yǔ)法必背知識(shí)點(diǎn)

虛擬語(yǔ)氣在一些特殊詞中的使用或含蓄條件句

1.wish后的賓語(yǔ)從句。

與現(xiàn)在愿望不一致，用主語(yǔ)十過(guò)去時(shí)，例如：

I wi。hIwere you.

與過(guò)去愿望不一致，用主語(yǔ)+had+過(guò)去分詞，例如：Iwish I had visited the White House whenI was in the States與將來(lái)愿望不一致，用主語(yǔ)+would (could)+原形。

2.It's time句型：當(dāng)lt's tine后用that從句時(shí)應(yīng)該為主i吾+should+動(dòng)詞原形或主語(yǔ)十過(guò)去時(shí)，例如：It，s time thatyou went to school.或It's time that you should go to schooL

3- If only引起的感嘆句相當(dāng)于“How I wish+賓語(yǔ)從句”。

(l)If only he could come.他要能來(lái)就好了。

(2)If only I had known the answer.我要早知道答案就好了。

4.WOuld rather，as if(though)引導(dǎo)的從句也需使用虛擬語(yǔ)氣，表示過(guò)去的情況用過(guò)去完成時(shí)，表示現(xiàn)在與將來(lái)的情況用過(guò)去時(shí)，例如：

(l)I'd rather you posted the letter right away.

(2)She loves the children as if they were hers.

5.含蓄虛擬條件句含蓄條件句是指句中沒(méi)有明顯的虛擬條件句，而是利用其他手段來(lái)暗示存在虛擬條件。但是這類隱含式虛擬條件句往往都可以轉(zhuǎn)化為if引導(dǎo)的條件句。常用來(lái)表示含蓄虛擬條件的手段有：

(1)介詞或介詞短語(yǔ)。如but for，but that，without,in case of, under more favorable condition等。

(2)連詞。如so that, unless, in case, supposing,lest, provided(倘若……)，for fear that(唯恐)，in orderthat, on condition that, if only(要是……就好了)等。

注意：lest, for fear that和in case引起的從句中謂語(yǔ)動(dòng)詞多用should+動(dòng)詞原形，但也可以不用虛擬語(yǔ)氣，而用動(dòng)詞的陳述語(yǔ)氣形式。例如：The foreign teacher spokeslowly in case we misunderstood him這位外籍教師說(shuō)得很慢以免我們誤解。

(3)通過(guò)上下文及內(nèi)在含義，句中往往有but,otherwise, unfortunately等類似轉(zhuǎn)折詞。

without, but. but for, otherwise引起的短語(yǔ)或句子常暗含著含蓄條件。例如：

①Without you,1 would never know him

②But for your oooperation, we wouldn't have done it

③But that she was afraid, she would have said no. .

④i would be most glad to help you, butI am busy now.

⑤I would have come to the party yesterday, but ljwas working.

⑥I am busy now, otherwise l would do you the favor!

高三英語(yǔ)語(yǔ)法基礎(chǔ)知識(shí)點(diǎn)

一、不定式做主語(yǔ)：

1、不定式做主語(yǔ)一般表示具體的某次動(dòng)作。動(dòng)名詞doing表示習(xí)慣的，經(jīng)常的動(dòng)作。

e.g:Tofinishthebuildinginamonthisdifficult.

Todosuchthingsisfoolish.

Toseeistobelieve.(對(duì)等)

注:1).不定式作主語(yǔ)時(shí),謂語(yǔ)用單數(shù)

2).當(dāng)主語(yǔ)較長(zhǎng)，謂語(yǔ)較短時(shí)，常用it做形式主語(yǔ)，而將不定式放到謂語(yǔ)的后面。

it做形式主語(yǔ)，不定式放在謂語(yǔ)動(dòng)詞之后常用于下列結(jié)構(gòu)中：

(1)Itis/was+adj.+ofsb.todo…

(2)Itis+adj.+forsb.+todo…

Itiseasy/difficult/hard/foolish/unwise/right/wrong/unnecessary

(3)itis+a+名詞+todo...

Itisapity/apleasure/apleasantthing/one’sduty/anhonor/ashame/acrime/noeasyjob…todo

Ittakes(sb.)sometime/courage/patience…todo…

Itrequirescourage/patience/hardwork…todo…

注意:probable和possible均可作表語(yǔ)，但possible可以用不定式作真實(shí)主語(yǔ)，而probable不能用不定式作真實(shí)主語(yǔ)。

Itisprobableforhimtocometothemeeting.(錯(cuò))

Itispossibleforhimtocometothemeeting.

Itispossible/probablethathewillcometothemeeting.

高三英語(yǔ)語(yǔ)法重要知識(shí)點(diǎn)

用固定的情態(tài)動(dòng)詞表示的虛擬語(yǔ)氣

1. should +動(dòng)詞原形(有時(shí)省略should)

(1)用在動(dòng)詞如advise, command, demand, desire, insist, order, propose, recommend, request, require, suggest, urge等后的賓語(yǔ)從句中。例如：

1)They requested that we (should) send a delegation to their country.

2)She urged that he write and accept the post.

(2)用在it is suggested, it is desired, it is required, it was ordered, it was proposed, it has been decided, it is necessary (essential, imperative, important, desirable) that等引出的主語(yǔ)從句中。例如：

1)It is desired that we (should) get everything ready by tonight.

2)It is necessary that the teacher (should) have a thorough knowledge of the subject he teaches.

(3)用在suggestion, motion, proposal, order, recommendation, plan, idea, requirement等引起的表語(yǔ)從句和同位語(yǔ)從句

例如：He put his coat over the child lest he should catch cold.