原七年級(jí)英語(yǔ)下冊(cè) Unit 4 Don't eat in class（第3課時(shí)）(Grammar Focus3c)同步語(yǔ)法精講精練課件 （新版）人教新目標(biāo)版

Unit 4Dont eat in class.第三課時(shí)(Grammar Focus3c)單元同步語(yǔ)法精講精練 含義：含義：祈使句是用來(lái)表示請(qǐng)求、命令或建議等的一種句型。其主語(yǔ)一般祈使句是用來(lái)表示請(qǐng)求、命令或建議等的一種句型。其主語(yǔ)一般為第二人稱(chēng)為第二人稱(chēng)you，但通常省略。祈使句的句末一般用句號(hào)但通常省略。祈使句的句末一般用句號(hào)，表示較強(qiáng)語(yǔ)氣時(shí)表示較強(qiáng)語(yǔ)氣時(shí)用感嘆號(hào)。為了使祈使句顯得更委婉、有禮貌用感嘆號(hào)。為了使祈使句顯得更委婉、有禮貌，可在開(kāi)頭或結(jié)尾加上可在開(kāi)頭或結(jié)尾加上please。 祈使句的四種類(lèi)型祈使句的四種類(lèi)型Do型祈使句：實(shí)義動(dòng)詞原形其他型祈使句：實(shí)義動(dòng)詞原形其他eg：Listen to me，please.請(qǐng)聽(tīng)我說(shuō)。請(qǐng)聽(tīng)我說(shuō)。Be型祈使句：型祈使句：be動(dòng)詞其他動(dòng)詞其他eg：Be quiet，please.請(qǐng)安靜。請(qǐng)安靜。Let型祈使句：型祈使句：Letsb.動(dòng)詞原形其他動(dòng)詞原形其他eg：Lets play football.讓我們踢足球吧。讓我們踢足球吧。eg：No smoking！禁止吸煙！No photos！禁止拍照！ 祈使句的否定形式通常是在謂語(yǔ)動(dòng)詞前加dont。但要注意以let開(kāi)頭的祈使句，其否定形式是：“Dontlet賓語(yǔ)動(dòng)詞原形其他”或“Let賓語(yǔ)not動(dòng)詞原形其他”。eg：Dont let him go swimming.Let him not go swimming.不要讓他去游泳。情態(tài)動(dòng)詞can與have to情態(tài)動(dòng)詞can的用法can意為“能；會(huì)”，表示做某事的能力，其否定形式為cant。eg：Can you speak English？你會(huì)講英語(yǔ)嗎？can還可表示“允許；許可”。eg：You cant eat in class.你不能在課堂上吃東西。情態(tài)動(dòng)詞have to的用法have to意為“必須；不得不”，其后接動(dòng)詞原形。have to有第三人稱(chēng)單數(shù)形式，即has to，變疑問(wèn)句和否定句要借助助動(dòng)詞do/does。eg：We have to go home after school.我們放學(xué)后必須回家。 一、用所給單詞的適當(dāng)形式填空。一、用所給單詞的適當(dāng)形式填空。1 (not play) with fire (火火)2Dont (run) in the classroom.3Let him (not play) the computer games.4Can we (eat) here?5Do you have to (go) to bed before ten at night?Dont playrunnot playeatgo二、單項(xiàng)選擇。6_ listen to music in the classroom.ANotBNoCDontDBe not7Tom，please _ the classroom now.Aclean Bto clean Ccleans Dcleaning8Lets _ on time for classes.Abe Bbe not Care DisCAA9She has to _ her homework every night.Adoes Bdo Cdoing Dis doing10Sorry，you _ play basketball in the classroom.Acant BdontCdont have to DarentBA三、按要求完成下列句子。三、按要求完成下列句子。11Lily can play the guitar.(改為一般疑問(wèn)句并作否定回答改為一般疑問(wèn)句并作否定回答) Lily the guitar? ，she 12Jack has to play the piano every weekend.(改為一般疑問(wèn)句改為一般疑問(wèn)句) Jack play the piano every weekend?13Be quick.(改為否定句改為否定句)Dont be quick.Can playNocantDoeshave to14You cant eat food in class.(改為祈使句改為祈使句)Dont eat food in class.15You must walk to school today.(改為祈使句改為祈使句)Walk to school today.16You cant be late for class next time.(改為祈使句改為祈使句)Dont be late for class next time.