Unit2GrammarFocus(3a~3d)课件人教版英语七年级下册

_________themin_________themsee___thegoodgirlyoualways______be____________youdon’tfeel__________themknowWellnowtheyknow_______itgo,_______itgo________holditbackanymore_______itgo,_______itgo_______mybackandslamthedoorDon’tletDon’tletBehavetoConceal(隐藏)Don’tletLetletCan’tLetletTurnUnit2NoRules,NoOrderGrammarFocus(3a-3d)LearningObjectives学习目标Knowhowtotalkaboutrulesbyusingimperatives(祈使句)

andmodalverbs(情态动词)

can,havetoandmust.Explainthemeaningsofthesigns(showingtherules)indifferentplacesandmakeareportaboutit.Understandtheimportanceoffollowingrules.ReviewDon’truninthehallways.Don’tbelate.Don’twearotherclothes!Don’tmakenoise.Noeating!Nophones!Don’tfight.Don’tlitter.ReviewWalkinthehallways.Don’tbelate.Wearschooluniforms!Be/Keepquiet.Bepoliteandtreateveryonewithrespect.Keepcleanandtidy.Walkinthehallways.Don’t

run!Bepoliteandtreatoneanotherwithrespect.Don’t

litter.祈使句(Imperativesentences)祈使句用于表示命令、请求、建议、劝告或禁止等的句子。（1）主语you通常被_______，一般以___________开头；（2）没有_______和_______的变化；（3）可在句首或句末加上_______表示礼貌；（4）句末用感叹号或句号，用_______来读。省略动词原形人称数please降调祈使句Imperativesentences命令建议祝愿请求警告劝说...Helpme,please.Havefun.Becareful...Nophotos.Let'sstarttheparty.

Don’tbesad.Standup.肯定否定肯定否定肯定否定否定Do型Be型Let型No型1234Walkinthehallways.Don’truninthehallways.Be

politetoeveryone.Don’tbe

lateforschool.Letmehelpyou.Don’tlethimrun.Lethimnotrun.Noswimming.Nophotos.祈使句分类表示强调时,可在动词原形前加do,意为“一定,务必”

Docometoseeme.一定要来看我。动原开头祈使句，有do,有be,有let,有No；主语是you常省去，加上please更礼貌，句末句首都可以；变否定，句首don’t莫忘记。祈使句句尾用句号或感叹号，读时用降调。句末用please时，前面通常加逗号。1.It’sanimportantmeeting.____________(not,be)late.2.____________(not,make)anynoise!Yourmotherissleeping.3.____________(not,talk)and__________(read)aloud.4.Thenoticeonthewallsays“____________”.(nosmoke)5._______(look)out!Acariscoming.6._________(not,let)thebabycry.7.Let’s________(notsay)anythingaboutit.Don’ttalkDon’tbereadNosmokingLookDon’tletnotsayDon’tmakeExerciseBepoliteandtreatoneanotherwithrespect.Youmustn’tlitter./Youcan’tlitter.Canwebringourphonestoclass?No,wecan’t.Wemustkeep

theminourlockers.Canwe

eat

snacksinclass?No,wecan’teatinclass.Wehavetoeatinthedininghall.情态动词Modalverbs

情态动词表示说话人对某一动作或状态的态度,或表示主观设想。(1)不能作谓语动词，必须和_________一起构成谓语；(2)一般没有_____和____的变化。动词原形人称数canmusthavetoP90情态动词can(1)表示_____Icanplaybadminton,butIcan'tplayvolleyball.(2)表示_____Youcanplaybasketballattheweekend.(3)表示_____

CanyouhelpmewithmyChinese?

could也可表示请求，比can的语气更_____：

Couldyoutellhimtocallmeback?能力许可请求委婉情态动词can的句型结构-Can

weplaybasketballattheweekend?

-Yes,youcan./No,youcan't.

Wecan't/cannot

playbasketballattheweekend.Youcanplaybasketballattheweekend.③一般疑问句及回答：

______________________________________________________________________②否定句：_____________________________________①肯定句：_____________________________________主语+can+动词原形+其他.主语+can't(cannot)

+动词原形+其他.-Can+主语+动词原形+其他?-Yes,主语+can./No,主语+can't.情态动词must(1)表示主观的义务或必要,无人称、数和时态的变化,意为“必须”。我必须做作业。

Imustdomyhomework.(2)表示肯定推测,常用于肯定句中,意为“一定、必然”。这个故事一定很有趣。Thestorymustbefunny.情态动词must的句型结构-MustIbehomebefore8o'clock?-Yes,youmust./No,youneedn't/don't/doesn’thaveto.Youmustn'tspeaklikethat.Hemustwearauniformtoschool.③一般疑问句及回答：________________________________________________________________________________________________②否定句：_______________________________________①肯定句：_______________________________________主语

+

must

+

动词原形

+

其他.主语

+

mustn't/mustnot

+

动词原形

+

其他.-Must+主语+动词原形+其他?-Yes,主语

+must./No,主语

+

needn't/don't/doesn’thaveto.mustn't表示“不应该”、“禁止”、“不准”。语气比较强烈。3.情态动词haveto(1)haveto意为“必须;不得不”，后接动词原形，表示客观需要

做的事情。现在我不得不离开。Ihavetoleavenow.(2)haveto有人称、数和时态的变化，其第三人称单数形式为

hasto。辛迪每天必须铺床。Cindyhastomakethebedeveryday.(3)含有

haveto或hasto的句子需分别借助助动词do

或

does

构成疑问句或否定句。她必须早起吗？Shehastogetupearly.

你不必8点钟到那儿。

Youhavetoarrivethereateight.Youdon’thavetoarrivethereateight.Doesshehavetogetupearly?情态动词haveto的句型结构-Doeshehavetogotobednow?

-Yes,hedoes./No,hedoesn't.Wedon'thavetocleantheroomtoday.Shehastolookafterhermotherathome.③一般疑问句及回答：______________________________________________________________________________________________________________②否定句：_______________________________________________①肯定句：_______________________________________________主语

+

have/has/had

to

+

动词原形

+

其他.主语

+

don't/doesn't/didn't

have

to

+

动词原形

+

其他.-Do/Does/Did

+

主语

+

have

to

+

动词原形

+

其他?-Yes,主语

+

do/does/did./No,主语

+

don't/doesn't/didn't.④特殊疑问句：____________________________________________疑问词+do/does/did+主语+haveto+动词原形+其他?Whatdoyouhavetodo?表达意义人称、数和时态否定形式havetomusthaveto&must侧重于客观需要,含有“不得不”的意思侧重于说话者的主观意愿,认为有必要或者有义务去做某事有人称、数和时态的变化,三单形式为hasto无人称,数和时态的变化don’t/doesn’thaveto“不必”mustn’t禁止“不要;不许”1.Don’tjumpthequeue.You_____________waityourturn.2.I____feedmydogmanykindsoffood,butI____________givehimchocolate.Itisbadforhim!3.A:CanIleavetheclassroomifIdon'tfeelwell?B:Yes,butyou____________tellyourteacheraboutitwhenyou______________beabsentfromclass.4.A:Hey!CanIlookatyourbook?B:Shh,we_____________talkquietlyinthelibrary.5.A:Canyouputonyourseatbelt?We____________wearonewhenwe’reinacar.B:Sure.Thanks!Completethesentencesusingcan,haveto/must,orcan't/mustn't.haveto/mustcancan’t/mustn’thaveto/musthaveto/musthaveto/musthaveto/must等你的顺序缺课安全带插队3bLookatthefirstsignandreadtherules.Thenwritetherulesfortheothersigns.Donoteatordrink.Noeatingordrinking.Youcan’t/mustn’teatordrink.3cDonotpark.Donottakephotos.Donotswim.Donotfeedanimals.Noparking.Nophotos.Noswimming.Nofeeding.Youcan’t/mustn’tpark.Youcan’t/mustn’ttakephotos.Youcan’t/mustn’tswim.Youcan’t/mustn’tfeedanimals.Brainstormthreerulesforoneoftheplacesbelow.Thendrawsignstoshowtherules.Shareyoursignsinclassandexplainwhattheymean.Inthelibrary,wemustkeepquiet.Wemustn’tmakenoise.Wecan’t…制造噪音libraryschooldininghallparkcinemahospital3c1._______(open)thedoor,Sara.2.________(notbe)lateforourfamilydinner.3.No_______(talk)inthelibrary!4.Please__________(notplay)computergamessomuch,Jim!5.Be_______(care)!Theknifemayhurtyou.6.I_____(can)playbasketballwithyou.Ihavetoomuchhomeworktodo.7.—Canyourparents_____(