SectionⅢGrammar——祈使句语境自主领悟先观察原句①Don'tbringyourcellphonetoschool.②Neverforgeteachofusisthemasteroftheearth.③Givemearingassoonasyougethome.④Writetomeassoonaspossible，willyou？⑤Let'slivealowcarbonlife，shallwe？⑥Letustakecareofthehousewhileyouareaway，willyou？⑦You，girls，cleanthedesks;you，boys，sweepthefloor.⑧Don'tstayoutsideatnight，willyou？⑨Doputyourheartintoyourstudiesbeforethecomingexam.后自主感悟1.①②句为否定祈使句，③④句为肯定祈使句。肯定祈使句以动词原形开头，否定祈使句以Don't或Never开头。2.由⑤⑥句可知，Let's引导的祈使句的反意疑问句用shallwe;Letus引导的祈使句的反意疑问句用willyou。3.由④⑥⑧句可知祈使句的反意疑问句通常用willyou。4.⑦⑨句中，在祈使句前可加you或do对句子表示强调，以加强句子的语气。1．祈使句的定义表示命令、请求、劝告、警告或禁止的句子叫祈使句。祈使句的主语一般为you，通常省略，谓语动词使用原形，句末用感叹号或句号。Bequiet，please.请安静。(请求)Goandwashyourhands.去洗手。(命令)Watchyoursteps.走路小心。(劝告)Lookout!Danger！小心！危险！(警告)Keepoffthegrass.勿践踏草坪。(禁止)2．祈使句的形式肯定结构(1)Do型(行为动词原形开头)Followtherulesoftheroad.遵守交通规则。Thisway，please.＝Gothisway，please.请这边走。(在意思明确的情况下可省略动词)(2)Be型(系动词be开头)Besuretogetherebeforenine.一定要在九点以前到这里。(3)Let型(Let's/Letsb.＋动词原形)Let'shaveameetingthisafternoon.今天下午我们开个会吧。Letmehaveatryifyoudon'twantto.如果你不想，让我试一次吧。否定结构(1)Do型和Be型的否定式都是在句首加Don't或Never构成。即：Don't/Never＋动词原形。Don'tbelatetomorrow.明天不要迟到。Neverputoffwhatyoushoulddotilltomorrow.今日事今日毕。(2)Let型祈使句的否定式有两种Don'tletsb./sth.do...;Let'snotdo...。Don'tletthechildrenplayinthestreet.别让小孩在街上玩耍。Let'snotwastetime.咱们别浪费时间了。No＋名词或动名词此类否定祈使句多表示禁止。Nosmoking！禁止吸烟！Nophotosintheroom.该房间不许拍照。[即时训练1]单句语法填空①Alwayskeep(keep)inmindthatourmaintaskistogetthiscompanyrunningsmoothly.②Everydayread(read)aproverbaloudseveraltimesuntilyouhaveitmemorized.③Don'tmake(notmake)anynoiseinthereadingroom.3．祈使句的反意疑问句(1)祈使句为肯定句，其反意疑问句用willyou/won'tyou?Cometohavedinnerwithusthisevening，will/won'tyou?今晚来和我们一块儿吃饭，好吗？(2)祈使句为否定句，其反意疑问句用willyou?Don'tsmokeinthemeetingroom，willyou?不要在会议室抽烟，好吗？(3)Let开头的祈使句构成反意疑问句时，除Let's开头的用shallwe外，其他均用willyou。Let'stakeawalkaftersupper，shallwe？我们晚饭后散散步，好吗？Letusgoswimming，Mum，willyou?妈妈，让我们去游泳，行吗？[即时训练2]写出下列句子的反意疑问句①ComeherenextSunday，will/won'tyou?②We'vebeenworkingfortwohours.Let'sstopandhavearest，shallwe?4．祈使句的强调形式常在谓语动词前加上do或称呼语表示强调或加强命令。Dobecarefulnexttime!下次一定要仔细！Mary，comehere—everybodyelse，staywhereyouare.玛丽过来，其他人都别动！[即时训练3]单句语法填空①Doputyourheartintoyourstudiesbeforethecomingexam.②David,don'tclose(notclose)thewindow,please!Ⅰ.单句语法填空1．Workhard，andyouwillgetpromoted.2．LetustakecareofGrandma，willyou?3．Don'tspeak(notspeak)withmouthfulloffood.4．Onemorehour，andwewillget(get)everythingreadyforthetakingoff.5．OurEnglishteacherisill.Let'sgoandseehimafterschool，shallwe?6．Give(give)ustenyearsandjustseewhatourcountrywillbelike.7．LiMing，read(read)thetext—everybodyelse，listencarefullyandseewhetherhispronunciationiscorrect....
