祈使句 (imperatives) 用来下命令、给指示或提请求。直接用动词原形开头,不要主语。
打开Open （冠词）the 门door 请, please.
请把门打开。
坐Sit 下down.
坐下。
否定: 前面加 Don't。
不要Don't （是）be 迟到late.
别迟到。
用法要点：
- 加 please 更礼貌:Please come in.(请进。)
- 也用于路线、说明:Turn left.(向左转。)Mix the eggs.(把鸡蛋打匀。)
注意 祈使句不写主语:~~You open the door~~(命令时)→ Open the door。
常见错误
- ❌ ~~Please open door.~~ → ✓ Please open the door. — 祈使句里冠词照样不能丢。
- ❌ ~~Don't to touch it.~~ → ✓ Don't touch it. — don't 后面直接跟动词原形,不加 to。
- ❌ ~~No talk in class!~~ → ✓ Don't talk in class! / No talking! — 禁止做某事用 don't + 原形;no 后面要用 -ing 或名词。
- ❌ ~~You sit down!~~ → ✓ Sit down, please. — 加了 you 的命令听起来很生气;想礼貌就加 please,或改问 Can you…?