当前位置：文档之家 › 初中英语If引导的条件状语从句(可编辑修改word版)

初中英语If引导的条件状语从句(可编辑修改word版)

  • 格式：docx
  • 大小：15.91 KB
  • 文档页数：6

初中英语――if 引导的条件状语从句

在 if 引导的条件状语从句中，if 和条件句位置灵活，可直接放在主句后面，若 if 条件句放句首， 从句后面要加逗号，和主句隔开。还要注意前后时态一致原则.引导条件状语从句的连接词主要有：if(如果）、unless（除非）或 as

long as（只要）等。unless 在意思上等于 if...not。

一、条件状语从句用法

1、引导条件状语从句最常用的连词是 if,由 if 引导的条件状语从句表示在某种条件下某事很可能发生。如：

If you ask him, he will help you.

如果你请他帮忙,他会帮你的。

If you fail in the exam, you will let him down.

如果你考试不及格,你会让他失望的。

另外,if 从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。如:

If I were you, I would invite him to the party.

如果我是你,我会邀请他参加聚会。

2、unless = if...not. 除非,若不,除非在……的时候例如：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.

Unless it rains, the game will be played.

除非下雨,比赛将照常进行。

二、时态问题

在条件状语从句中，要注意“主将从现”的规定，即主句用一般将来时，从句用一般现在时表示将来时。例句：

I will come to see you if I have time.

我有时间，我就来看你。

三 如果 if 条件句谈论的是重复发生和预示要发生的情景和事件，则主从句大多用一般现在时态。如：

If bears are in danger ,they attack people.

误区提醒

if 既可以引导条件状语从句，表示“如果”，也可以引导宾语从句，表达“是

否”。辨别它在这两种从句中的时态是我们经常容易出错的地方。另外，if 和

unless 的用法也需注意。

典型例题： ----I wonder if your wife to the party.

----If your wife , so will mine。.

A. will go， go B. will go, goes

C.goes, will go D. will go, will go

解析：第一句中 if 表示“是否”，引导宾语从句，用将来时 will go；第二句“如果你的妻子去，我的妻子也去”，if 引导条件状语从句，用一般现在时表示将来时。 your wife，单三人称主语，所以用 goes 。 总结

IF 引导的

一、表示将来可能发生的：

(1) If sb does sth, sb will do sth

= sb will do sth if sb does sth

主句一般将来时 从句一般现在时

(2) 主句为祈使句或情态动词形式If sb does sth, please do sth

If sb does sth, sb may(情态动词) do sth

二、表必然发生的

If sb does sth, sb/sth does

sth

= sb/sth do sth if sb does sth

主句一般现在时， 从句一般现在时（相当于 when 引导的从句）

Unless 引导的

sb will do sth unless sb does sth

if sb does not do sth 练习

1. He (fail) in the exam if he (not study) hard.

2. Unless you (leave) now, you (be) late.

3.We (have) a barbecue unless it (rain) .

4.Hurry up, or you will miss the bus.（同义句转换）

you don’t hurry up, you catch the early bus.

5. Study hard, or you’ll miss fall behind. （同义句转换）

you study hard, you fall behind.

6. If you don’t put on your scarf, you’ll catch cold. （同义句转换）

Put on your scarf, you’ll catch cold.

7.I don’t know if it tomorrow. ）(表是否，用将来时态)

If it ,I won’t go shopping. (rain) （表如果，用现在时态）

8.I want to know if he (come) tomorrow, if he (come),

I (give) the massage to him.

9. Please let us know if he (arrive) tomorrow.

请告诉我们他明天是否会来

Please let us know if he (arrive) tomorrow.

如果他明天来的话请告诉我们

10.I’m sure if he (go) to the party, he (have) a great

time.

11.If the rain (stop) tonight, we will go to the cinema.

12.I’ll buy a computer if I (have) enough money. 13.You (not get) nervous if you (do ) enough exercise.

14.If she (be) kind to me , I (not argue) with her.

15. If you (pay) more attention to that, he (not get)

injured.

16. Mr Li will be mad if we (break) the rules.

17. If it (be) cloudy, they (not go) there by air.

18. Shall I say “Hello” when the foreigner (come) into the

classroom?

19. He’ll get better grades if he (study )hard.

20. If you work really hard, you (be) famous and rich.

if 条件状语从句的时态练习

一．在正确的答案下划一条线。

1. Daina ( will go/go/goes) to Europe if she (will pass/pass/passes) the exams .

2. The graduates (will teach/teach/teaches) in the poor village if the Ministry of

Education (will agree/ agree/agrees) soon.

3. If a UFO (will land/land/lands) in front of me, I (will go/go/goes) in to look for the

alien.

4. If he (will have/have/has) money, he (will bulid/build/builds) a science lab.

5.Don’t wait for me if I (am/ will be) late.

6. They (won’t/don’t) go to the beach if it (will rain/rain /rains).

7. I (will call/ call) you if he (will stay/stay /stays) at home.

8. (Will / Do/ Does) he visit the museum if he (won’t / don’t/ doesn’t) get tired?

9. Where (will/ do/does) they live if they (will miss/ miss/ misses) the bus?

二、用所给词的适当形式填空

1.If you (feel) tired, you (have) to have a rest.

3. If there (be) fewer trees, there ( be) more pollution.

5. If Marcia (live) alone, she ( keep) a pet

parrot.

6. Lana ( buy) a new dress if the old one (be) out of

style.

7.The twins (fight) if they (argue).

8. I (have) a bake sale if I (need) money for education.

9. Peter ( send) me a beautiful souvenir if he (tour)

Spain.

10. If Mr Green (say) I am hard- working, my parents ( feel)

glad.

11.I (go) to the beach if it ( not rain) this week.

12. they ( have) a match if the P.E. teacher

(be) busy?

13.He (write) a letter to his grandparents if he (get) his report card this week.

14. If she (get) up late, she ( not catch) the early bus.

15. Peter (major) in English if he (pass) the exams in Peking

University.

Ⅰ.单项选择（15 分）

1. If you to the party, you’ll have a great time. A. will go B. went C. go D.

going

2. It will be a long time Peter his work.

合集下载

If引导的条件状语从句

If引导的条件状语从句

If引导的条件状语从句

一、If引导的条件状语从句的结构

If+主语+谓语+其它,主语+谓语+其它.=主语+谓语+其它+if+主语+谓语+其它.

注 ：①有if 的是从句,另一个是主句

② if 从句在前有逗号，if从句在后无逗号

eg.If he runs, he will arrive there in time .=He will arrive there in time if he runs .

如果他跑，她将会准时到达.

二、if条件句主句和从句的时态，if译为如果

1.主句用一般将来时（will+ V-原），if 从句用一般现在时（be用is/am /are ,

实义动词用V-原/V-三单 ）, 即主将从现

注：①当主语为I ,you, we, they ,复数名词，以及由and连接的两个并列成分等时，实义动词用V-原

②当主语为he ,she ,it ,that ,单个人名，单数名词等时，用V-三单）

eg .If it is (be) rainy , we will stay(stay) at home .

If she studies (study ) hard , she will get (get) good grades .

2.若主句中含有情态动词(can/may/ must/may/might/should )时 ，

主句为情态动词+ V-原 ，if从句用一般现在时

eg .We can will go(go) out if it stops (stop ) raining .

eg.If you want (want) to get good grades ,you should study (study)hard.

3.若主句为肯定祈使句或否定祈使句时，if从句用一般现在时

注：以V-原开头的句子是肯定祈使句 ，否定祈使句在V-原前加Don’t

eg. Eat (eat) them if you are (be) hungry .

if 条件状语从句

if 条件状语从句

if引导的条件状语从句

引导条件状语从句最常用的连词是if，常见的if条件状语从句表示在某条件下，某事很可能发生，条件是可能存在的，主句中某种情况发生的概率也是很高的。如：

一， 第一类：

1） 表示普遍真理和客观事实：

If you heat ice ,it melts .

If you pour oil on water,it floats.

不受时间限制的自然法则的条件句，主句，从句都是一般现在时。

2） 表示习惯性的动作

If I make a promise , I take it .

If it rains ,I go to work by car.

表示一个现在习惯性的动作，主句和从句的谓语动词都是一般现在时。

3） 表示过去的习惯性，经常的动作

If it rained,I went to work by car.

If I was hungry, I usually had a full meal.

主句和从句谓语动词要依据时间来变为一般过去时。

Activity：questions and answers :

What do you like to drink if you are very thirsty? How many days are there in February it it is a leap year ?

Who do people go and see if they get ill ?

第二类：

If we catch the 10 o’clock train ,we shall (will ,can,

may,must ,should ) get there in time .

If it is fine tomorrow ,we can have a picnic somewhere.

If you wake up before me , give me a call .

关于IF引导的条件状语从句

关于IF引导的条件状语从句

上个学期，我们曾经学过由if 引导的句子，你还记得吗？对了，“ I’ll not go to the zoo if it rains

tomorrow. ( 假如明天下雨，我就不去动物园。) You can come to the party if you don’t wear

jeans.（ 如果你不穿牛仔裤，你就能来舞会。）” 这个学期又在本单元见到了似曾相识的同样由if引导的句子，比如：“If I won the lottery, I would give it to medical research. （ 假如我赢了彩票的话，我就捐给医学研究。） If I were you, I would wear jeans and T-shirt.（ 如果我是你，我就穿牛仔裤和T恤。）”

这两个单元学到的句子都是由if引导的。那么，它们有什么区别呢？

分两种情况：

1．something may possible happen

某事发生的可能性较大。

这种情况，有个十三字口诀：“主将从现，主过将从过，主现从现”。即主句是一般将来时，从句用一般现在时；主句用过去将来时，从句用一般过去时；当主句中有can/can’t的话，则从句用一般现在时。例如：

If he has time, he will come tomorrow.

If she finishes early, she can come back early.

If you don’t do homework, the teacher will scold you

即：,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。如:

If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会。

I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车,我会到的早一点儿。

if引导的条件状语从句修改

if引导的条件状语从句修改

1

if引导的条件状语从句

▲ if 引导的条件状语从句中，if 意思为“如果”，有以下两种基本句型:

▲(1) if + 从句（用一般现在时），主句（主语 + will (not) + 动词原形……）

或：主句（主语 + will (not) + 动词原形……）+ if + 从句 （用一般现在时）

注意时态：主句用一般将来时，从句用一般现在时

1 如果你喜欢观光，你会爱上它的。_________ you like _________________, you _________________ it.

2 如果你沿着外滩走，你会看见很多古老的建筑。

(1) _________ you walk ____________ the Bund, you __________________ many old ________________.

(2) You _________________ many old buildings ____________ you ______________________ the Bund.

3 如果你喜欢历史和自然美，你会爱上这个花园的。

You ______________________ this garden ____________ you _________________ history and __________________ beauty .

4 如果你戴着(wear)眼镜，你会看得很清楚。

You ______________________ clearly _________ you ____________________ your glasses .

5 如果明天下雨，我就坐车去上学。I _______________ to school by bus _________ it __________ tomorrow