2017年高考英語語法必考知識(shí)點(diǎn):條件狀語從句

2016/09/27 08:46:26文/網(wǎng)編3

學(xué)分網(wǎng)給各位考生整理了2017年高考英語語法必考知識(shí)點(diǎn):條件狀語從句,希望對(duì)大家有所幫助。更多的資訊請(qǐng)持續(xù)關(guān)注學(xué)分網(wǎng)。(http://mlvmservice.com/)

▲高考英語語法必考知識(shí)點(diǎn):條件狀語從句

由引導(dǎo)詞if或unless引導(dǎo)的狀語從句叫做條件狀語從句。在英文中,條件是指某一件事情實(shí)現(xiàn)之后(狀語從句中的動(dòng)作),其它事情(主句中的動(dòng)作)才能發(fā)生,通常譯作“假如”。(注意:在含有條件狀語從句的復(fù)合句中,表示將來時(shí)態(tài),主句是一般將來時(shí)態(tài),祈使句或情態(tài)動(dòng)詞,從句要用現(xiàn)在時(shí)態(tài),[主將從現(xiàn)原則]

▲高考英語語法必考知識(shí)點(diǎn):條件狀語從句的類型

語法引導(dǎo)條件狀語從句最常用的連詞是if,由if引導(dǎo)的條件狀語從句表示在某種條件下某事很可能發(fā)生。如:

1) If you ask him,he will help you.如果你請(qǐng)他幫忙,他會(huì)幫你的。

2) If you fail in the exam,you will let him down.如果你考試不及格,你會(huì)讓他失望的

if引導(dǎo)的條件狀語從句既可以將從句放前面也可以將從句放后面

(如果天下雨,我們就不玩了)If it rains,we will stop playing.‘

轉(zhuǎn)為We will stop playing if it rains.

另外,if從句還表示不可實(shí)現(xiàn)的條件或根本不可能存在的條件,也就是一種虛擬的條件或假設(shè),從句多用一般過去時(shí)或過去完成時(shí)。如:If I wereyou,I would invite him to the party.如果我是你,我會(huì)邀請(qǐng)他參加聚會(huì)。I would have arrived much earlier if I had not been caught in the traffic.如果沒有堵車,我會(huì)到的早一點(diǎn)兒。

那么,除了if之外,是否還有其他連詞也可以引導(dǎo)條件狀語從句呢回答是肯定的,不僅有,還有很多。這些詞由于出現(xiàn)的頻率較小,且用法較復(fù)雜一些,所以不如if為大家所熟知罷了。下面就這些詞的用法以例句的形式進(jìn)行一下簡(jiǎn)單總結(jié)。

1、unless conj.除非,若不,除非在……的時(shí)候

You will fail to arrive there in time unless you start earlier.如果你不早點(diǎn)動(dòng)身,你就不能及時(shí)趕到那兒。

Unless it rains,the game will be played.除非下雨,比賽將照常進(jìn)行。

2、on condition(that)...在……條件下,如果 on condition (that)...引導(dǎo)的條件從句是主句事件發(fā)生的前提條件或唯一條件。

I can tell you the truth on condition that you promise to keep a secret.我可以告訴你真相,條件是你答應(yīng)保密。

You can go swimming on condition (that) you don't go too far from the river bank.你只有在不遠(yuǎn)離河岸的條件下才可以下水游泳。

3、supposing conj.如果,假如 supposing引導(dǎo)的條件從句表示一種假設(shè)條件。

Supposing it rains,shall we continue the sports meeting倘若下雨,我們的運(yùn)動(dòng)會(huì)還要繼續(xù)舉行嗎

Supposing anything should go wrong,what would you do then假如出了什么問題,你準(zhǔn)備怎么對(duì)付

4、provided conj.假如,除非,以……為條件 provided (that) +從句表示一種假設(shè)條件。

He will sign the contract provided we offer more favorable terms.如果我們提出更優(yōu)惠的條件,他就會(huì)在合同上簽字。

He won't be against us in the meeting provided that we ask for his advice in advance.如果我們提前征求一下他的意見,他就不會(huì)在會(huì)上反對(duì)我們。

從上述例句可以看出if,unless,on condition (that),supposing,provided等詞引導(dǎo)的條件狀語從句,主從句條件關(guān)系分明,結(jié)構(gòu)清晰。

但有些句子,雖沒有含條件關(guān)系的連詞,卻也隱含著條件關(guān)系,這些句子常用一些詞,如but for,without等引出一個(gè)介詞結(jié)構(gòu)來表示條件,條件應(yīng)該是虛擬的,或與事實(shí)相反的假設(shè)。

如:but for若非,要不是

But for the rain,we should have a pleasant journey.要不是下雨,我們的旅行肯定會(huì)很愉快。

But for your help,we should not have finished in time.要不是你幫忙,我們肯定不能及時(shí)完成任務(wù)

經(jīng)典語句:If it dosen't rain tomorrow,we will go to the zoo.

If you open the door,i will come in.

條件狀語從句就是用以表示“在某種條件下,會(huì)……”常用if,in case,on condition等詞來引導(dǎo)

連接詞主要有 if,unless,as/so long as,on condition that,provided,suppose,supposing 等..

主句用一般將來時(shí),if或unless引導(dǎo)的條件狀語從句用一般現(xiàn)在時(shí)。

【注:在條件狀語從句中,絕大數(shù)情況下some要變?yōu)閍ny。】

▲高考英語語法必考知識(shí)點(diǎn):條件狀語從句的用法

unless = if...not.

e.g. Let's go out for a walk unless you are too tired.

If you are not too tired,let's go out for a walk.

if 引導(dǎo)的條件句有真實(shí)條件句和非真實(shí)條件句兩種:

真實(shí)條件句

如:If it rains tomorrow,we won’t go on a park非真實(shí)條件句是虛擬語氣的一種,表示與事實(shí)相反,如:

If I were you,I would go with him.

so/as long as只要

由as (so) long as,in case引導(dǎo)。

So long as you’re happy,it doesn’t matter what you do.

只要你高興,你做什么都沒有關(guān)系。

You may borrow my book as long as you keep it clean.

只要你保持書的清潔,你就可以把我的書借去。

Take your umbrella in case it rains.

帶著你的傘吧,以防下雨。

例句

引導(dǎo)條件狀語從句的連詞有:if(如果),unless(除非;如果不),as long as(除非;只要),supposing(假設(shè)),on condition that(條件是),in case(如果)。

【例】

You can't learn English well unless you work hard.

除非你努力學(xué)習(xí),否則你學(xué)不好英語。

You can use my bike on condition that you return it by Friday.

你可以使用我的自行車,條件是你星期五以前還。

1)學(xué)習(xí)條件狀語從句應(yīng)注意以下幾點(diǎn):

⑴條件狀語從句中一般不使用將來時(shí)態(tài),盡管主句使用將

來時(shí)態(tài),而從句用一般現(xiàn)在時(shí)或現(xiàn)在完成時(shí)。

【例】

I will come to see you if I have time.

我有時(shí)間,我就來看你。

If the rain stops,I shall go out for a walk.

如果雨停了,我就出去散步。

⑵注意條件狀語從句在虛擬語氣中的使用。

【例】

If I were to I should first of all get the experts to discuss the plan.

如果我真的想做這事,我首先會(huì)找專家們討論我的計(jì)劃。

⑶條件狀語從句中的省略。

【例】

Come tomorrow if possible. 可能的話,明天來。

I will buy a DVD set if necessary.

▲高考英語語法必考知識(shí)點(diǎn):條件狀語從句例句

If the telephone rings,I will answer it.

If you get up late,you will be late for school.Look and say

If you feel hungry,you should eat something.

If you feel tired,you must have a rest.

If you are ill,you must go to see a doctor.

If you are riding a bike in the street,you must be very careful.

If it is fine tomorrow,we will have a school trip.

If I have enough money,I will travel around the world.

If you eat bad food,you may be ill.Come with me if you have time.We will come to see you if we have time.

When you arrive at home,please tell me.

After you read this book,please clean the room.

Before he does his homework,he will watch TV.

He won't go to bed until his mother comes back.

I will tell you as soon as Tom finishes his work.

when(連詞,“當(dāng)...的時(shí)候”),

after(連詞,“在...之后”),

before(連詞,“在...之前”),

until(連詞,“直到...為止”),

as soon as(連接性詞組,“一...就...”).

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2017年高考英語語法必考知識(shí)點(diǎn):比較狀語從句
2017年高考英語語法必考知識(shí)點(diǎn):方式狀語從句
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