2．祈使句的形式

肯定

结构 (1)Do型(行为动词原形开头)

Follow the rules of the road.遵守交通规则。

This way，please.＝ Go this way，please.请这边走。(在意思明确的情况下可省略动词)

(2)Be型(系动词be开头)

Be sure to get here before nine.一定要在九点以前到这里。

(3)Let型(Let's/ Let sb.＋动词原形)

Let's have a meeting this afternoon.今天下午我们开个会吧。

Let me have a try if you don't want to.如果你不想，让我试一次吧。 否定

结构 (1)Do型和Be型的否定式都是在句首加Don't或Never构成。即：Don't / Never＋动词原形。

Don't be late tomorrow.明天不要迟到。

Never put off what you should do till tomorrow.今日事今日毕。

(2)Let型祈使句的否定式有两种Don't let sb./sth.do...; Let's not do...。

Don't let the children play in the street.别让小孩在街上玩耍。

Let's not waste time.咱们别浪费时间了。 No＋名词

或动名词 此类否定祈使句多表示禁止。

No smoking！禁止吸烟！

No photos in the room.该房间不许拍照。 　　

　　[即时训练1]　单句语法填空

　　①Always keep (keep) in mind that our main task is to get this company running smoothly.

　　②Every day read (read) a proverb aloud several times until you have it memorized.

　　③Don't make (not make) any noise in the reading room.

　　3．祈使句的反意疑问句

(1)祈使句为肯定句，其反意疑问句用will you/ won't you?