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祈使句1、定义：祈使句是用来表示请求、命令、劝说、号召、警告等的句子。在祈使句中，通常省略第二人称主语you，以动词原形开头。句末一般用句号；表示较强语气时，则用感叹号。2、类型：1、V型：动词原形+其他2、Be型：Be+形容词3、Let型：Letsb+其他4、No型：No+v-ing/n3、注意：①表示委婉、客气时，常加please(可放句首，句末<用逗号隔开>)②祈使句的否定形式：一般在句首加don’t③Let型的祈使句变否定句，可在句首加don’t,或在动词原形前加not.4、祈使句用法口诀祈使句，祈使句，请求命令或建议。主语是you常省去，动词原形开头记。否定形式加Don’t，Let否定有两种。想更客气please,句首句末没关系。练习I.用括号内所给动词的适当形式填空。1.It’sanimportantmeeting.______(not,be)late.2._______(not,make)anynoise!Yourmotherissleeping.3._______(not,speak)withyourmouthfulloffoodand_____(be)polite.4.______(not,talk)and_______(read)aloud.5.____(not,leave)yourhomeworkfortomorrow,Larry.6._____(look)out!Acariscoming.7.______(give)ustenyearsandjustseewhatourcountrywillbelike.8._______(not,let)thebabycry.9.Let’s_____(not,say)anythingaboutit.II.选择填空()1.Herdoctorsaid:“________worksohardAStopBDon’tCCan’tDNo()2.Cindy,______tobehereat8o’clockAissureBissurethatCwillbesureDbesure()3._______whenyoucrosstheroadADocareBCareCBecarefulDTobecareful()4.________himthesecret,willyou？ADon’ttellBNottotellCNottellingDNotelling()5.________inbed.It’sbadforyoureyes.ANottoreadBDon’treadCDon’ttoreadDNotread()6.________yourchild.We’lllookafterhim.ANottoworryaboutBDon’tworryaboutCNotworryforDDon’tworrywith()7.______tellalie.AHardlyBNotCNoDNever()8.Please________lookoutside.LookattheblackboardAnotBdon’tCaren’tDcan’t