Greet the class.

( 2 )语言知识详细讲解

1. Don't run in the hallways. 别在走廊里跑。

祈使句，表示请求，命令，劝告等，通常省略主语you.其后谓语动词用原形。

有肯定和否定两种。

Stand up, please. 起立。

Let's go to the park.

否定的祈使句是在动词前加Don't.

Don't eat in class.

Don't swim in the river.

2. What are the rules? Well, we can't arrive late for class.

rule 作名词 obey the rules

be against the rules

break the rules

rule 作动词 统治，支配

eg: The king ruled the country 500 years ago.

3.祈使句型

a.V型（行为动词原形）+其他

Listen to me, please.

b.B型（Be+形容词+其他）

Please be quiet.

c.L型 祈使句

Let+sb+V原+其他

Let me help you./ Let's go.

d.D型祈使句

Don't+V原+其他

Don't eat in class.

3.课堂小结：

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