一. 祈使句的特殊结构
1、no+名词或动名词
No smoking. 不许吸烟
2、have done＋动名词
Have done beating him ! 不要再打了
3、be+形容词或名词
Be careful! 小心
4、be+过去分词
Be seated,please! 请坐
5、be+现在分词
Don't be sitting down when headmaster is talking! 请不要在校长讲话时坐下！
6、do+祈使句
Do save us! 天哪！
7、与附加疑问句连用
Open the door,will you?开下门，好吗？
二. 祈使句与陈述句的转换
(1)普通祈使句=You must …
Come here .=You must come here.
(2)Please +祈使句=Will you (please) ～?
Please help me .=Will you (please) help me
三. 祈使句与条件句的转换
祈使句有时相当一个“if”引导的条件状语从句。
eg. Use your brain and you'll answer the question.= If you use your brain，you'll answer the question.
四. 直接引语和间接引语转换，其常用结构为“ask/request/tell/order sb(not)to do sth“。
eg.“Sit down，please!” the teacher said to me．=The teacher asked me to sit down.
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