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。

　　[即时演练1]

　　(1)单句语法填空

　　①(2015·湖南高考改编)Always keep (keep) in mind that your main task is to get this company running smoothly.

　　②(2014·湖南高考改编)Make (make) what you're doing today important, because you're trading a day of your life for it.

　　③(2014·北京高考改编)Observe (observe) carefully if any change occurs when doing experiments in the lab.

　　④(2013·湖南高考改编)Every day read (read) a proverb aloud several times until you have it memorized.

　　(2)翻译句子

　　①过马路时要小心。

　　Be_careful_when_crossing_the_road.

　　②从不放弃你的梦想。

　　Never_give_up_your_dream.

　　③教室里不许抽烟。

　　No_smoking_in_the_classroom.

　　④不要在阅览室里发出噪音。

　　Don't_make_any_noise_in_the_reading_room.

　　⑤进我的房间之前，请先敲门。

　　Knock_at_the_door_before_you_enter_my_room,_please.

　　三、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, will you/won't you?

　　今晚来和我们一块儿吃饭，好吗？

　　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?