祈使句后也可以加简略问句，表示语气。  否定祈使句+will you?   肯定祈使句+won’t you?   肯定祈使句+will you?（表示请求）   Let’s … + shall we?   Let us … + will you?   Let +第三人称……+ will you?注：let us与let’s的区别：（1）let us do sth. 让(或允许)我们做某事；即提出请求，请对方允许，而对方不做，只有我们做。附加疑问句用will you?      如：Let us have a rest, will you? 让我们休息一下，好吗？（2）let’s do sth. 咱们去做某事吧；即提出建议，劝诱对方一同做某事，附加疑问句用shall we?      如：Let’s go for a picnic, shall we? 咱们去野餐吧，好吗？总结祈使句的用法
祈使句所能表达的含义：命令：Make your bed at once! 马上把床铺好！禁止：Don’t touch! 不要碰！请求，恳求：Shut the door, please. 请关门。 Help! 救命！忠告，劝告：Lock the door before you go to bed. 睡觉前把门锁上。建议，指示：Let’s have a party! 咱们举行个聚会吧。                 Take the first street on the left.走右边第一条街。邀请：Make yourself at home! 请自便（别客气）        Come in and sit down. 进来坐。         Help yourself to some fruit. 吃点水果。提供：Have some orange juice. 喝点橙汁吧。祝愿：Have a good time! 祝你（过得）愉快！警告，威胁：Look out! 当心！                 Do that again and you will be in trouble! 你在那样做会倒霉的！允诺：Finish your homework and I’ll buy you some food.做完作业就给你买吃的。诅咒：Go to hell! 滚！自忖：Let me see now. 让我考虑考虑。