肯定的祈使句和否定的祈使句
1. 肯定的祈使句:动词原形+其他 Stand up, please. Be careful!
2.否定的祈使句:
1). Don't + 动词原形 Don’t laugh at others.
2). Never do sth. Never dothat again!
3). No + v-ing/n. No smoking! No noise, please.
4). Let’s not do sth. Let’snot waste time.
5). Don’t let sb. do sth. Don’t let them make any noise.
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