种类2 祈使句
| 用来发出命令或指示，提出要求、建议、劝告等的句子 （主语通常被省略，谓语动词没有时态和数的变化） |
|
|---|---|
| 肯定祈使句 | 1. Do 型：动词原形+其它 |
| Put the books in your bag. | |
| 2. Be 型：Be +名词/形容词 | |
| Be careful. / Be a good student. | |
| 3. Let 型：Let +宾语+动词原形+其它 | |
| Let me help you. | |
| 否定祈使句 | 1. Don't 型：Don't +动词原形+其它 |
| Don't go there, please. | |
| 2. Never 型：Never +动词原形+其它 | |
| Never do that again. | |
| 3. No 型：No +动名词/名词 | |
| No smoking! / No photos! | |
| 补充 | 祈使句+ and +陈述句（表结果）……，那么……（陈述句用一般将来时） |
| 祈使句+ or +陈述句（表结果）……，否则……（陈述句用一般将来时） | |