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1、第三課時(shí) (Grammar Focus3c) 祈使句 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)一般為第二人稱(chēng) you, 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)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 please。 祈使句的四種類(lèi)型 Do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)。 Be型祈使句: be動(dòng)詞其他 eg: Be quiet, please.請(qǐng)安靜。 Let型祈使句: Let sb.動(dòng)詞原形其他 eg: Lets play football.讓我們踢足
2、球吧。 No型祈使句: No v.ing/名詞! (表示禁止 ) 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:“ Dont let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 , 其否定式為 cant
3、。 eg: Can you speak English?你會(huì)講英語(yǔ)嗎? 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)句和否定句要借助動(dòng)詞 do/does 。 eg: We have to go home after school.我們放學(xué)后必須回家。 一、單項(xiàng)選擇。 1 _____ listen to music in the classroom. A Not B No
4、C Dont D Doesnt 2 Tom, please _____ the classroom now. A clean B to clean C cleans D cleaning 3 Lets _____ on time for classes. A be B be not C are D is 4 She has to _____ her homework every night. A does B do C doing D did 5 Sorry, you _____ play basketball in the classroom. A cant B dont C dont ha
5、ve to D doesnt C A A B A 二、用括號(hào)內(nèi)所給單詞的適當(dāng)形式填空。 6 (not play) with fire (火 ) 7 Dont (run) in the classroom. 8 Let him (not play) basketball. 9 Can we (eat) here? 10 Do you have to (wear) the school uniform at school? Dont play run not play eat wear 三、按要求完成句子。
6、 11 Lily can play the guitar.(改為一般疑問(wèn)句并作否定回答 ) Lily the guitar? , she 12 Jack has to play the piano every weekend.(改為一般疑問(wèn) 句 ) Jack play the piano every weekend? 13 Be quick.(改為否定句 ) _____________________________________________ 14 You cant eat food in class.(改為祈使
7、句 ) _____________________________________________ 15 You must walk to school today.(改為祈使句 ) _____________________________________________ 16 You cant be late for class next time.(改為祈使句 ) _____________________________________________ Can play No cant Does have to Dont be quick. Dont eat food in class. Walk to school today. Dont be late for class next time.