1、Imperatives 祈使句祈使句祈使句用来表示命令、劝告、请求、禁止。祈使句用来表示命令、劝告、请求、禁止。通常主语通常主语you会省去，以原形动词为句首。会省去，以原形动词为句首。Open the door!Stand up!Come here!Hurry up!祈使句的特殊结构祈使句的特殊结构1.no+名词或动名词名词或动名词用于指示标牌、布告，意为用于指示标牌、布告，意为“禁止，不许禁止，不许”。No parking!No spitting!No litter!No entry!No scribbling on the wall!2.以以 have done 起首起首这种结构相当于这
2、种结构相当于 stop(doing)，有时表示，有时表示“结束，停止结束，停止”。Have done!住手！住手！Have done running!跑完了！（不要跑跑完了！（不要跑了）了）3.be+过去分词过去分词Be seated,please.Be reassured.Be gone！4.be+现在分词现在分词祈使句也可以有进行式。祈使句也可以有进行式。Do be sweeping the floor when I come in!我进来时，（你）一定在擦地板吧！我进来时，（你）一定在擦地板吧！5.do+祈使句祈使句这种结构表示强调，常译为这种结构表示强调，常译为“务必，务必，一定要一定
3、要”。Do save us!Do tell me the reason.Do be honest.注注 意意祈使句的主语祈使句的主语祈使句的主语多为不言而喻的祈使句的主语多为不言而喻的 you，一般，一般不出现。但若是要强调主语，或表示急躁、不出现。但若是要强调主语，或表示急躁、厌烦、不高兴、愤怒等感情色彩，或表示厌烦、不高兴、愤怒等感情色彩，或表示向谁请求或发出命令，祈使句可有主语，向谁请求或发出命令，祈使句可有主语，除除you外，还可以用不定代词外，还可以用不定代词one,someone,somebody,everyone,everybody或名词。或名词。You mind your ow
4、n business!Away you go!Somebody close the window!One stay here!Anybody dont stand there.You wait and see.祈使句的否定式祈使句的否定式祈使句的否定式一般式在谓语动词前加祈使句的否定式一般式在谓语动词前加do not 或或dont（口语中），有时也可用（口语中），有时也可用never；若祈使句有主语，否定词；若祈使句有主语，否定词dont或或never要置于主语之前，不可用要置于主语之前，不可用do not。Do not come in unless asked.Dont you believ
5、e it.Never be late again next time.祈使句的附加疑问句祈使句的附加疑问句(1).在祈使句的附加疑问句中，在祈使句的附加疑问句中，附加疑问附加疑问部分一般用部分一般用 will you?回答部分则用回答部分则用(Yes)I will.或或(No)I wont.-Turn down the TV,will you?-Yes,I will./No,I wont.(2).以以 Lets 开头的祈使句开头的祈使句,其附加疑问句其附加疑问句一般用一般用 shall we，而，而 以以Let us开头的祈使开头的祈使句句,其附加疑问句则用其附加疑问句则用 will you。
6、因为因为 lets 中的中的 us 包含听话者即被请求者，而包含听话者即被请求者，而 let us 中的中的 us 不包含不包含 听话者在内。听话者在内。Lets practice our spoken English,shall we?（即请求者要求与被请者一起练习）（即请求者要求与被请者一起练习）Let us play the football this afternoon,will you?？（踢足球的人不包含被请求？（踢足球的人不包含被请求者）者）无动词祈使句无动词祈使句一般来讲，祈使句都要有动词，但是有些一般来讲，祈使句都要有动词，但是有些用于口号、告示等的祈使句却是没有动词用于口号
7、、告示等的祈使句却是没有动词的，虽为只言片语，却简洁明了。的，虽为只言片语，却简洁明了。Patience!Danger!After you!Hands up！This side down!祈使句常考查句式祈使句常考查句式1).祈使句祈使句+and/or+陈述句陈述句 Work hard and you can make rapid progress in your study.2).祈使句祈使句+破折号破折号+陈述句陈述句 Try some of this juice perhaps youll like it.尝尝这种果汁，也许你会喜欢的。尝尝这种果汁，也许你会喜欢的。3)名词词组名词词组+
8、and+陈述句陈述句,名词词组中通名词词组中通常含有常含有more,another,further,earlier Another$500 and I could buy a car.假如我再有假如我再有500磅，就能买辆小汽车了。磅，就能买辆小汽车了。1._ it with me and Ill see what I can do.A.When left B.Leaving C.If you leave D.Leave2._,I think,and the problem could be worked out.A.If you double your efforts B.So long a
9、s you keep your spirits C.A bit more efforts D.Making great efforts DC3.(2010高考题高考题)If you have a job,_ yourself to it and finally youll succeed.A.do devote B.dont devote C.devoting D.not devoting APractice 1.-English has a large vocabulary,hasnt it?-Yes._ more words and expressions and you will fin
10、d it easier to read and communicate.A.Know B.Knowing C.To know D.KnownA2.Stand over there _ youll be able to see it better.A.or B.while C.but D.and D3.-Ive never seen anyone run so fast.-_ David go.A.just watch B.just to watch C.just watching D.just having watchedA 4.-Dont forget to my birthday part
11、y tomorrow.-_.A.Yes,I wont B.No,I wont C.No,I will D.Yes，I will B5.Be sure to write to us,_?A.will you B.arent you C.can you D.mustnt you A6.One more week,_ we will accomplish the task.A.or B.so that C.and D.if C7._ blood if you can and many lives will be saved.A.Giving B.Give C.Given D.To give B8._
12、 this book and tell me what you think of it.A.Look through B.Look on C.Look into D.Look upA9._ it with me and Ill see what I can doA.When left B.Leaving C.If you leave D.LeaveD-Susan,go and join your sister cleaning the yard.-Why _?John is sitting there doing nothing.A.him B.he C.I D.meWhy me?=Why d
13、o you ask me to do that?D_ at the door before you enter my room,please.A.Knock B.Knocking C.Knocked D.To knockATranslate the sentences into English.1.你方便的话请在下午你方便的话请在下午6点钟来。点钟来。2.你离开时请关上灯。你离开时请关上灯。3.只要你招招手马上就有出租车开过来。只要你招招手马上就有出租车开过来。Please come at 6:00 p.m.if it is convenient for you.Please turn/switch off the lights as/when you leave.Simply raise your hand and a taxi will appear in no time.
