+动词原形
Don't be late tomorrow.
明天不要迟到。
Never put off what you should do till tomorrow.
今日事今日毕。
(2)Let型祈使句的否定式有两种:Don't+let+宾语+动词原形(+其他成分);Let's not+动词原形(+其他成分)。
Don't let the children play in the street.
别让小孩在街上玩耍。
Let's not waste time.
咱们别浪费时间了。
3.No+名词/动名词。此类否定祈使句多表示禁止。
No smoking!禁止吸烟!
No photos in the room.该房间不许拍照。
二、祈使句的反意疑问句
(1)祈使句为肯定句,其反意疑问句用will you/won't you。
Come to have dinner with us this evening,won't you?
今晚来和我们一块儿吃饭,好吗?
Turn down the TV,will you?
把电视声音调小一些,可以吗?
(2)祈使句为否定句,其反意疑问句用will you。
Don't smoke in the meeting room,will you?
不要在会议室抽烟,好吗?
(3)Let开头的祈使句构成反意疑问句时,除Let's开头的用shall we外,其他的均用will you。
Let's take a walk after supper,shall we?
我们晚饭后散散步,好吗?
Let the boy go first,will you?
让那个小男孩先走,可以吗?