八上Unit9SectionA-2.ppt
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1、Unit 9 Section A Period 2 (3a-3c)A: Can you come to my birthday party?B: Sure, Id love to. birthday partyA: Can you go to the concert?B: Im sorry, I cant. I have to prepare for an exam.go to the concertprepare for an examA: Can you go to the movies?B: Im sorry, I cant. I have to go to the doctor.A:
2、Can he go to the movies?B: No, he cant. He has to go to the doctor. go to moviesgo to the doctorA: Can you go to the zoo?B: Sorry, I cant. I have to help my parents.A: Can he go to the zoo?B: No, he cant. He has to help his parents.go to the zoohelp my parentsA: Can you play computer games with me?B
3、: Sorry, I cant. I have to go to the baseball game.A: Can he play computer games with me?B: No, he cant. He has to go to the baseball game.play computer gamesgo to the baseball gameA: Can you play soccer with me?B: Sorry, I cant. I have to watch TV.A: Can she play soccer?B: No, she cant. She has to
4、watch TV.play soccerwatch TVAccept (接受接受) invitations:Sure / Yes / Of course, Id love to.Certainly, Id like to.Decline (拒绝拒绝) invitations:Im sorry, I cant. I have to look after my grandmother. I have to study for a math test. I am going shopping with my friend. Can you .? 意为意为“你能你能吗?吗?”,可用,可用于邀请别人或委
5、婉地请求某人去做某事。其肯于邀请别人或委婉地请求某人去做某事。其肯定回答常用定回答常用 Sure, Id love / like to. ,否定回答,否定回答常用常用 Im sorry, I cant. / Sorry, I cant. 等。如:等。如: - Can you go to the baseball game? 你能去参加棒球比赛吗?你能去参加棒球比赛吗? - Im sorry, I cant. 对不起,我不能。对不起,我不能。Explanation 单项填空单项填空 - Can you help me with my English this weekend? - Sorry,
6、I _. I have a lot of homework to do. A. cant B. mustnt C. neednt D. dont答案:答案:A 题意:题意:“请问这个周末你能帮我请问这个周末你能帮我学习英语吗?学习英语吗?”“”“对不起,我不能。我有对不起,我不能。我有很多作业要做很多作业要做” 。不能答应他人的请求时。不能答应他人的请求时常用常用“(Im ) Sorry, I cant.”。 情态动词情态动词have to与其他的情态动词如与其他的情态动词如can、may、must和和should” 不同。不同。 (1)这)这4个情态动词没有人称的变化个情态动词没有人称的变化
7、, 而而have to有。它的第三人称单数为有。它的第三人称单数为“has to”。 You / He should study hard. 你你/他应该好好学习。他应该好好学习。 He has to study hard. 他不得不好好学习。他不得不好好学习。have to 的用法的用法(2)这)这4个情态动词在一般疑问句中将它们放在个情态动词在一般疑问句中将它们放在句首句首, 在否定句中直接在他们后边加在否定句中直接在他们后边加not即可。即可。我们以我们以can为例为例: Can he go with us? 他能和我们一起去吗?他能和我们一起去吗? He cant go with us
8、. 他不能和我们一起去。他不能和我们一起去。 而而have to要加助动词要加助动词do , does或或 did 才才可能完成其疑问、否定句。可能完成其疑问、否定句。 试将下面三种话分别写成试将下面三种话分别写成 (1)一般疑问句,并作肯定回答。)一般疑问句,并作肯定回答。 (2)否定句。)否定句。 a. They have to go to the party. Do they have to go to the party? Yes, they do. They dont have to go to the party. b. He has to go to see the doctor
9、. Does he have to go to see the doctor? Yes, he does. He doesnt have to go to see the doctor. c. She had to study for a math test yesterday. Did she have to study for a math yesterday? Yes, she did. She didnt have to study for a math yesterday.have to 与 must二者都有二者都有“必须必须”之意,但之意,但 have to 表示表示“客观上的需要
10、客观上的需要”,有人称和时态的变化,有人称和时态的变化,否定形式为否定形式为 dont / doesnt / didnt have to (没没必要必要);must 表示表示“主观上的要求主观上的要求”,无人称,无人称和时态的变化,否定回答一般用和时态的变化,否定回答一般用 neednt 或或 dont have to (不必不必)。mustnt 表示表示“禁止禁止”。如:如:比一比比一比 We have to wear warm clothes in winter. 冬天我们不得不穿上暖和的衣服。冬天我们不得不穿上暖和的衣服。(客观需客观需要要) I must finish my homew
11、ork first before I watch TV. 看电视前我必须先完成作业。看电视前我必须先完成作业。(主观要求主观要求) You dont have to tell him about it. 你不一定要把此事告诉他。你不一定要把此事告诉他。 You mustnt tell him about it. 你一定不要把这件事告诉他。你一定不要把这件事告诉他。 Must I be home before eight oclock? 8点之前我必须回家吗?点之前我必须回家吗? Yes, you must. / No, you neednt. / No, you dont have to. 是
12、的,必须回家。是的,必须回家。/不,不必。不,不必。 Bob cant come out to play because he _ help Dad in the garden. A. can B. must C. has to D. have to答案:答案:C 题意:题意:鲍勃不能出来玩了,他得在花园里帮鲍勃不能出来玩了,他得在花园里帮他爸爸。表示客观上的需要,应用他爸爸。表示客观上的需要,应用 have to;句子为一般现在时,主语为第三人称单数,句子为一般现在时,主语为第三人称单数,故选故选 C。即时练即时练(2008厦门中考厦门中考) - I cant give up smoking
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