Be quiet guys Open your books please Let

祈使句 Be quiet , guys! Open your books, please! Let start our new lesson. Let’s Don’t be noisy, guys! Don’t eat in class, please! Don’t let him sleep in class. 一般用来表示请 求、命令、劝说、 号召、警告等。 肯定：动词原形开头 否定：Don’t +动词原形开头

类型 肯定祈使句 Be型 V原型 （行为动词） Be quiet , guys! Open your books, please! Let型 Let’s start our new lesson.

类型 Don’t +动词 原形 Be型 Don’t be noisy, guys. 否定祈使句 V原型 （行为动词） Don’t eat in class, please! Let型 Don’t let him sleep in class.

Let型否定祈使句 （1）Don’t +let （2）Let +宾语+not + V原+其它 Don’t let him sleep in class. Let him not sleep in class.

Library Rules No talking! Don’t talk! No food! Don’t eat or drink! No music! Don’t listen to music! Don’t smoke! No smoking!

勇往直前 Don’t+V原 1. Please clean our classroom every day. （改为否定句） Please don’t clean our classroom every day. Be型 2. Don’t be friendly to others. （改为肯定句） Be friendly to others.

V原型（行 为动词） 抵达彼岸 1. Can you pass me this book? （改为祈使句） Please pass me this book. 2. Teachers often tell students not to be late for school. （改为祈使句） Be型 Don’t be late for school, please.

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