大学英语：附加疑问句的回答

要针对所陈述的内容，不受附加疑问成分的制约。

—You didn’t go there alone,did you?

—No,I didn’t.

—You love coffee,don’t you?

—Yes,I do.

Types of Sentence:the Imperative

12.祈使句的作用

（1）表示命令和指示

Don’t make any noise.

Let the boy say what he wants.

(2)表示建议、劝告或警告

Don’t be upset.

Write to me if you need further information.

(3)请求和呼吁

Come quickly.Help!

Do help me,please.

(4)邀请

Drop in whenever you have time.

Come in and have a cup of tea.

(5)解释

Take Class 5 for example.

Look at the situation in the Middle East for example.

13.祈使句的基本形式

祈使句的第二人称主语you通常省略，以动词原形开头，句尾用句号或感叹号。

Sit down.

Take your share of the water!

祈使句的否定形式是在动词前加don’t,但在正式文体中则用do not。

Do not litter in the park!

Do not feed the animals!

也可在动词前加never。

Never forget the past.

Never put off until tomorrow what you can do today.(谚语)