八年级英语上：Unit 13 Safety Rules Part 3课件北京课改版.ppt

unit13safetyrulespartiiilanguageinuse revision grammarfocusi practicei grammarfocusiiandpracticeii grammarfocusiiiandpracticeiii summaryandexercises homework v forstudentswhocometoschoolonfoot they can whenthelightisgreen theymust before theycrosstheroad v forstudentswhocometoschoolbybike they must theyshould acrossthecrosswalksandinschool crosstheroad lookbothrightandleft stopfortheredlight walkthebike basictrafficrulers forstudentswhocometoschoolbybus theymust and theymustn t atthebusstop whenthebusarrives theymust firstand theymust togetonthebus onthebus theymust andmustn t youmustobeythetrafficrules youmuststopfortheredlight youmustn tputyourheadoutofthebuswindows youmustn tplayfootballontheroadway grammarfocusireadandunderstand writedownwhatthesesignsmean youmustn tstophere youmustn tswimhere youmustn tsmokehere youmustn tturnleft youmuststophere youmustdriveat40kilometers lookandusemustormusn tmakesentences comehomeafterschool playcomputergamesoutside youmust youmustn t comehomeafterschool playcomputergamesoutside stayaway playwithknife youmust youmustn t stayawayfromknives playwithknife becareful openthedoor youmust youmustn t becarefulastranger openthedoorforastranger youmust youmustn t stayawayfromthetigers givefoodtothetigersnearthecage 要求某人做某事时 可以用youmustdosth 或remembertodosth 例如 你必须遵守交通规则 记住在人行道上骑单脚滑行车 youmustobeythetrafficrules remembertorideyourscooteronthesidewalk grammarfocusii youmuststayawayfromscissors orremembertostayawayfromscissors keep 不允许某人做某事时 可以说youcan tdosth 或don tdosth 语气在强一点可以用neverdosth 或者youmustn tdosth 例如 你千万不要在河里游泳 禁止在此处吸烟 千万不要在迟到了 千万不要把头 胳膊或叫伸出车窗外 youmustn tswimintheriver youmustn tsmokehere neverbelateagain neverputyourhead arms orfeetoutofthebuswindows grammarfocusiii youmustn tgoneartheopenwindows ornevergoneartheopenwindows touchsth summaryandexercises 1 情态动词may表示 可以 含有may的一般疑问句表示请求 许可时 它的否定句回答不能用maynot 而是can t或mustn t 我可以用你的电脑吗 可以 不 不能用 mayiuseyourcomputer yes youmay no youcan t no youmustn t 2 情态动词must表示 应该 必须 否定形式mustnot mustn t 表示 不应该 不允许 不准 等 本单元mustn t的主要用法是表示禁止和警告 在回答must的问句时 肯定回答是yes youmust 否定回答是no youneednot needn t 表示 不必 而不用mustn t 我现在必须走吗 是的 你必须走 不 你不必走 mustigonow yes youmust no youneedn t canigivefoodtothetigers mustiobeythetrafficrules maywegoboatinginthelake mustwecomebackintheafternoon no youneedn t butyoumustreturnbefore7 yes youmust oritwillbedangerous i mafraidyoucan t youmustn tgoneartheseanimals yes youmay butyoumustwearthelifejackets cbda matchthequestionswiththeanswers homeworkwriteashortparagraphonhomesafety usingmust remembertoorneverinyo