祈使句動(dòng)畫定義：用于表達(dá)

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等的句子叫作祈使句。命令請求勸告警告禁止Goandwashyourhands.（去洗你的手。——命令）Bequiet,please.（Pleasebequiet.）（請安靜。——請求）Bekindtooursister.（對(duì)姊妹要和善。——?jiǎng)窀妫￤atchyoursteps.（走路小心。——警告）

(禁止亂扔垃圾。——禁止)Nosmoking.Doyourhomework.Sitdown,please.實(shí)義動(dòng)詞原形開頭Bequiet!Becareful!Let'splayfootball!Let'ssingtogether!動(dòng)詞Let開頭Noswimming!Nosmoking!No+動(dòng)詞的ing形式祈使句的肯定式祈使句的肯定句式有三種形式，即1).Do型(以行為動(dòng)詞原形開頭)

例如:Sitdown坐下!Standup起立！2).Be型(以be開頭),

例如:Bequiet安靜！3).Let型（以let開頭）例如:Letmehelpyou.讓我來幫助你。Don'tbelateDon'teatfastfood!Noswimming!祈使句的否定式祈使句的否定結(jié)構(gòu)是以“Don't＋動(dòng)詞原形”開頭Don'tgothere,please．請別去那兒。Don'tbelate．不要遲到。Don'tlethimin．不要讓他進(jìn)來。Don'tletthewaterrunintotheroom.不要讓水流進(jìn)屋里。No+動(dòng)詞ing型，表示禁止Nofishing!Beagoodboy!Buymeatoycar!

肯定形式否定形式1.Be型：系動(dòng)詞原形be+表語+其他3.Let型：Let+賓語+動(dòng)詞原形+其他2.Do型：行為動(dòng)詞的原形+賓語+其他1.Be型：Don't+be+表語+其他2.Do型：Don't+行為動(dòng)詞+賓語+其他3.Let型：1)Don't+let+賓語（第三人稱）+動(dòng)詞原形+其他2)Let+賓語（第一、三人稱）+not+動(dòng)詞原形+其他Lethimgo!Don'tbelateforschool!Don'tbuymeatoycar!Don'tlethimgo!Lethimnotgo!Let'snotgo!4.有些可用no開頭，用來表示禁止性的祈使句。Nosmoking!Nofishing!祈使句的表現(xiàn)形式祈使句用法口訣祈使句，無主語，只要?jiǎng)釉~就可以；表示請求或命令，加上please表客氣；如果變成否定句，Don’t開頭是旋律；NOtalking！是警示，祈使用法要牢記！牢記，牢記，再牢記1.Jim,_____meahand.A.givesB.isgivingC.willgiveD.give2.____careful,Jenny!Thereisatreeinfrontofyou.A.AmB./C.BeD.Was3.Let's____ourtime.A.notwasteB.nowastingC.nottowasteD.nowaste4.—____higher,andyouwillseethehouse.—OK.A.IfyoustandB.TostandC.WhenyoustandD.Stand5.Please___doit.A.heB.lethimC.letheD.him6._____letanyoneopenthedoor.A.Don'tB.WillC.NotD.No7.—Don’tbelateagain.—Sorry,______.A.ImayB.ImustC.Iwill