Unit 10 If you go to the party讲解

If there is no water，we can't live.如果没有水，我们就不能生存。

→We can't live without water.没有水我们不能生存。

1．如 果if引导的从句中用了will，will在此处是情态动词，表示意愿。

If you will help me，I'll finish it on time.如果你愿意帮我，我会按时完成的。

2．在谈论将来可能出现的情况时，主句还可以是含有其他情态动词的句子或者是祈使句。

We may go out if it's fine tomorrow.如果明天天气好的话，我们可能会出去。

Please call me if you go shopping next Sunday.如果下周日你去购物，请给我打电话。

3．if 引导的条件状语从句和宾语从句的差别：

if引导的条件状语从句 意为“如果……”，其时态遵循“主将从现”规则。

I'll tell you about it if you come.如果你来，我就告诉你关于它的情况。

if引导的宾语从句 意为“是否……”，其时态受主句谓语动词的限制。若主句谓语动词为现在时或将来时，if引导的宾语从句要根据实际情况来恰当使用时态。

I don't know if he will help me.我不知道他是否会帮助我。

【例1】If your friend ______，I'll tell you.

A．come B．will come C．comes D．are coming

解析 if引导的是条件状语从句，主句用了一般将来时，故从句用一般现在时。 答案 C

句意 如果你的朋友来了，我会告诉你的。

【例2】 If you go to college，you ______a good education.

A．will get B．get C．gets D．got

解析 if引导的条件状语从句用一般现在时，主句用一般将来时，故选A项。 答案A

句意 如果你上了大学，你会得到好的教育。

【例3】I want to know if they______ tomorrow.

A．come B．will come C．comes D．came

解析 此处if 引导的是宾语从句，句中有 时间状语tomorrow，故用将来时态。答案 B句意 我想知道他们明天是否会来。

【例4】 Take enough exercise，______you'll be in good heath.

A．or B．so C．but D．and

解析 由句意知，前后句为顺承关系，应用and来连接。 答案 D句意 进行足够的锻炼，你的身体就会健康。

【例5】 用括号中所给词的正确形式填空

(1)If it______(not rain)，he______(play)basketball with me tomorrow.

(2)If Uncle Ian ______(come)，I______(call)you up.

(3)She must see a dentist if she______(have)a toothache.

(4)Please wake me up if he______(come)back.

(5)Hurry up！Or you ______(be)late again.

点拨：(1)(2)题都是一般的if引导的条件状语从句，遵循主句用将来时，从句用一般现在时的原则；(3)(4)题为主句是含有情态动词的句子或者是祈使句，情态动词后接动词原形，从句用一般现在时；(5)题为“祈使句＋or＋一般将来时”的句子。 答案：(1)doesn't rain；will play (2)comes；will call (3)has (4)comes (5)will be

Unit 10 If you go to the party，you´ll have a great time! Section B & Self Check讲解和例题 Section B 2b

a．If people have problems，they should get advice from an expert.

b．If people have problems，they should talk to other people.

c．①If people have problems，they should try to keep them to themselves.

Students these days often have a lot of worries：Sometimes t hey have problems with their schoolwork，and sometimes with their friends.What can they do about this？Some people believe the worst thing is to do ura Mills，a teenager from London，agrees.“Problems and worries are normal in life，” says Laura.“But I think talking to someone helps a lot.②Unless we talk to someone，we'll certainly feel worse.”

Laura once lost her wallet，and worried for days.She was afraid to tell her parents about it.She even walked three miles to school each day because she didn't have any money.She just kept thinking，“If I tell my parents，they'll be angry！” ③In the end，she talked to