初中英语七下 unit 4 Section A 2d-Grammar

SectionA2d-GrammarDon’teatinclassUnit4RevisionDon'tbelate.Wemustbeontime.Wehavetobeontime.Wecan’tbelate.RevisionDon'tfight.Wecan’tfightwithourclassmates.Wemustbegoodwithourclassmates.RevisionCanwe......?Readtheconversationandfillinthechart.DOsDONsbelateforclassbringmusicplayerstoschoolbeontimeweartheschooluniformbequietinthelibrary2dListenandthenreadaloud2dGrammarFocusDon’truninthehallways.Don’tfight.Whataretherules?Wemustbeontimeforclass.Canweeatintheclassroom?No,wecan’t,butwecaneatinthedininghall.Canwewearahatinclass?Yes,wecan./No,wecan’t.Doeshehavetowearauniformatschool?Yes,hedoes./No,hedoesn’t.Whatdoyouhavetodo?Wehavetobequietinthe

library.祈使句一般用来表示请求、命令、劝说、号召、警告等。在祈使句中，通常省略主语you，其肯定形式以动词原形开头，否定形式是在动词原形前加don’t。祈使句句尾用句号或感叹号，读时用降调。为表示礼貌，可以在句首或句尾加上please。句末用please时，前面通常加逗号。祈使句

Languagepoints祈使句的形式(1)let开头的祈使句的肯定句：Let+sb.+v.（原形）例:让我们帮助你。Don’tletthemcomein.Letushelpyou.否定为：Don’t+let+第三人称代词+v.（原形）例:不要让他们进来。

Languagepoints(2)非let开头的祈使句的肯定句和否定句：肯定句Do型Be

型动词原形（+宾语）+其他成份.Be+表语(名词或形容词）+其他成份.例：Listentome,please.例：Bequiet,please.请听我说。请安静。Languagepoints否定句Don’t+行为动词+其他.Don’t+be+其他.No+n./v.-ing.例:Don’tplaycomputergames.例:Don’tbelateagain.例:Nophotos.Noswimming.不要玩电脑游戏。不要再迟到。不许拍照。不许游泳。LanguagepointsLanguagepoints情态动词can1.表示能力：“会，可以，能，能够”2.不能单独作谓语，后必须接动词原形一起构成谓语3.没有人称的数的变化4.否定形式加not:cannot,cannot,或缩写can't疑问句can提前。

例：Ican'tplaythegutar.

Canweeatintheclassroom?Languagepoints情态动词情态动词must与haveto1.must:表示说话人的主观看法，即主观上的必要性”必须”，还用来表示命令和愿望。如：Youmuststopattheredlight.

2.haveto表示客观需要，即周围的环境、习惯等要求某人”不得不”或”必须”去做某事。如：Youhavetoaddsomewaterintotheflour.Languagepoints情态动词情态动词must与haveto在回答must引起的问句时，如果是否定的答复，可用don’thaveto或needn’t(不必),但不能用mustn’t(一定不,必须不,不允许,不得)

如：Youmustn'tdriveveryfastneartheschool.haveto的否定形式为nothaveto，相当于needn’t，意为“不必”如：Shedoesn'tneedtocleanitnow.3aWritetherulesfortheschoollibrary.

LibraryRules1.______________________________2.______________________________3.______________________________4.______________________________Don’ttalk.1234Don’teatinthelibrary.

Don’tlistentomusicinthelibrary.Don’ttakephotosinthelibrary.Tips1.由图示可知都是一些禁止类的祈使句。2.可知应用“Don’t+动词原形”句子。3bUsethewordstomakequestionsabouttherules.Thenwriteanswersaccordingtoyourschool.Q:____________________________________(she/have

to/in

thelibrary)?A:____________________________________.Bequiet?Doesshehavetobequietinthelibrary?Yes,shedoesTips1.观察疑问句，提出助动词、情态动词。2.第二位提出主语+动词，剩下按常规写完。Eat?Q:___________________________________(he/haveto/in

thedininghall)?A:___________________________________Doeshehavetoeatinthedinninghall?Yes,hedoes.Q:___________________________________(we/can/inthe

hallways)?A:___________________________________Listentomusic?Canwelistentomusicinthehallways?No,wecan’t.Wearahat?Q:___________________________________(we/can/inthe

classroom)?A:___________________________________Canwewearahatintheclassroom?No,wecan’t.3cMakeupfivecoolrulesforyourdreamschool.Shareyourruleswiththeclass.YourclassmatesvotefortheCoolestSchool!1.Wecaneatinclass.2.Wedon’thav