What should we do next? 接下来我们应该做什么呢？

You shouldn't do the thing your mother doesn't like. 你不应该做那些你妈妈不喜欢的事。

练习：You have made some mistakes again. I think you_____ be more careful next time.

A can B may C should D would

-----How was the youth club last night, Mark?

-----It was great fun. You ____ come.

A would B mustn't C should D shouldn't

Ⅲ、if 引导的条件状语从句。

（1）定义：有一个或者一个以上的从句构成的句子叫复合句。

在复合句中修饰主句的从句叫状语从句。

状语从句根据其所表达的意思可以分为很多种，例如：条件状语从句，时间状语从句等。

If 引导的从句在复合句中表示条件，做主句的条件状语，故称为条件状语从句。

Eg：If it doesn't rain tomorrow, we'll have a picnic. 如果明天不下雨，我们就去野餐。

（2）if 引导条件状语从句的时态问题：

① 在条件状语从句中，主句如果是一般现在时，从句用一般现在时表示将来时。

Eg： If it rains, I will stay at home. 如果下雨，我就呆在家里。

I'll go with you if you don't want to go alone. 如果你不想一个人去，我会陪你去。

② 如果主句含有must，may,can 等情态动词，从句也用一般现在时。

Eg：If you drive fast, you may have an accident. 如果你超速驾驶，就可能会出交通事故。

You must stop if the traffic light is red. 如果红灯亮了，你必须停下来。

③ 如果主句是祈使句，从句也用一般现在时。

Eg：Be careful with your homework if you don't want to make mistakes.

如果你不想出错的话就仔细检查你的作业。

Do not forget water the flower if you want to make it lives long.

如果你想让花活得长一点，就不要忘记给花浇水。

练习：

-----Lucy，what about going camping if it ______ tomorrow.

-----Sounds great!

A didn't rain B doesn't rain C won't rain

--- If Bob _____ away from the junk food, he will be in good health.

A stay B will stay C stays