Unit 9
Can you come to my party?
Section A
Period 2 (3a-3c)
A: Can you come to my birthday party?
B: Sure, I’d love to.
birthday party
A: Can you go to the concert?
B: I’m sorry, I can’t. I have to prepare for an exam.
go to the concert
prepare for an exam
A: Can you go to the movies?
B: I’m sorry, I can’t. I have to go to the doctor.
A: Can he go to the movies?
B: No, he can’t. He has to go to the doctor.
go to movies
go to the doctor

A: Can you go to the zoo?
B: Sorry, I can’t. I have to help my parents.
A: Can he go to the zoo?
B: No, he can’t. He has to help his parents.
go to the zoo
help my parents
A: Can you play computer games with me?
B: Sorry, I can’t. I have to go to the baseball game.
A: Can he play computer games with me?
B: No, he can’t. He has to go to the baseball game.
play computer games
go to the baseball game
A: Can you play soccer with me?
B: Sorry, I can’t. I have to watch TV.
A: Can she play soccer?
B: No, she can’t. She has to watch TV.
play soccer
watch TV
Accept (接受) invitations:
Sure / Yes / Of course, I’d love to.
Certainly, I’d like to.
Decline (拒绝) invitations:
I’m sorry, I can’t.
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“你能……吗？”，可用于邀请别人或委婉地请求某人去做某事。其肯定回答常用 Sure, I’d love / like to. ，否定回答常用 I’m sorry, I can’t. / Sorry, I can’t. 等。如：
--- Can you go to the baseball game?
你能去参加棒球比赛吗？
--- I’m sorry, I can’t.
对不起，我不能。
单项填空
--- Can you help me with my English this
weekend?
--- Sorry, I ______. I have a lot of homework
to do.
A. can’t B. mustn’t
C. needn’t D. don’t
答案：A 题意：“请问这个周末你能帮我学习英语吗？”“对不起，我不能。我有很多作业要做” 。不能答应他人的请求时常用“(I’m ) Sorry, I can’t.”。
情态动词have to与其他的情态动词如can、may、must和should” 不同。
（1）这4个情态动词没有人称的变化, 而have to有。它的第三人称单数为“has to”。
You / He should study hard.
你/他应该好好学习。
He has to study hard.
他不得不好好学习。
have to 的用法
（2）这4个情态动词在一般疑问句中将它们放在句首, 在否定句中直接在他们后边加not即可。
我们以can为例:
Can he go with us?
他能和我们一起去吗？
He can’t go with us.
他不能和我们一起去。
而have to要加助动词do , does或 did 才可能完成其疑问、否定句。
试将下面三种话分别写成
（1）一般疑问句，并作肯定回答。
（2）否定句。
a. They have to go to the party.
Do they have to go to the party?
Yes, they do.
They don’t have to go to the party.
b. He has to go to see the doctor.
Does he have to go to see the doctor?
Yes, he does.
He doesn’t 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 didn’t have to study for a math yesterday.
have to 与 must
二者都有“必须”之意，但 have to 表示“客观上的需要”，有人称和时态的变化，否定形式为 don’t / doesn’t / didn’t have to (没必要)；must 表示“主观上的要求”，无人称和时态的变化，否定回答一般用 needn’t 或 don't have to (不必)。mustn’t 表示“禁止”。如：
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。(客观需要)
I must finish my homework first before I watch TV.
看电视前我必须先完成作业。(主观要求)
You don't have to tell him about it.
你不一定要把此事告诉他。
You mustn't tell him about it.
你一定不要把这件事告诉他。
—Must I be home before eight o’clock?
8点之前我必须回家吗？
—Yes, you must. / No, you needn't. / No, you don't have to.
是的，必须回家。/不，不必。
Bob can’t come out to play because he _____ help Dad in the garden.
A. can B. must
C. has to D. have to
答案：C
题意：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 have to；句子为一般现在时，主语为第三人称单数，故选 C。
即时练
(2008·厦门中考) --- I can’t give up smoking, doctor.
--- For your health, I’m afraid you ________.
A. may B. can C. have to D. must
【解析】选C。may 意为“可能、或许”，can 意为“能、会”，have to 意为“必须、不得不”，表客观要求，而must 表主观愿望。根据题意：为了健康，你必须戒烟，选C。
【2010 四川达州】--- Must I finish my homework right now?
--- No, you ____.
A. needn’t B. may not
C. mustn’t D. can’t
【解析】must 在表示“必须, 应该”的时候，其疑问句的否定回答常用needn’t 或don’t have to, 表示“不必”，而不用must not。根据句意must 在句中作“必须”讲，故答案选A。
watch TV
on the weekend
my cousin
visit grandparents
Complete the answers with might and one of the phrases in the box.
3a
1. A: What are you going to do on Saturday?
B: I’m not sure. I might _______________________
2. A: What are you planning to do after school?
B: I don’t know. _______________________
visit my grandparents
I might watch TV.
3. A: When will you finish the science homework?
B: ______________________
_________________________
4. A: Who are you going to the movies with?
B: ______________________
_________________________
5. Are you free to come to my place on Saturday?
B: ______________________
_________________________
watch TV
on the weekend
my cousin
visit grandparents
I don’t know. I might finish it on weekend.
I’m not sure. I might go with my cousin.
I’m not sure. I might have to practice the violin.
3b
Complete the sentences below. Use the words in brackets to help you.
1. Inviting: _______________________________ (can/play tennis)
Accepting: _______________________________
2. Inviting: _______________________________
___________(would like to/go to the movies)
Refusing: _______________________________
Reason: _________________________________
(might have to)
Can you play tennis on Saturday?
Sure. That sounds great.
Would you like to go to the movies on Friday?
Sorry, I can’t.
I might have to go out with my parents.
3. Inviting: _______________________________
(can/ hang out with us tonight)
Refusing: _______________________________
Reason: ____________________________(must)
4. Inviting: _______________________________
________________ (would like to/come to my birthday party)
Accepting: _______________________________
Can you hang out with us tonight?
Sorry, I’m not free.
I must study for a test.
Would you like to come to my birthday party?
Sure. I’d love to.
invite v. 邀请
① The man invited my father to go fishing with him this morning.
这个男人今天上午邀请我爸爸和他一起去钓鱼。
根据句①可知“邀请某人干某事”为invite sb. to do sth.。
Key points
② I invited him to my house yesterday.
我昨天邀请他来我家。
根据句②可知invite sb. to后也可跟名词。
③ He will not come without your invitation.
没有你的请柬他是不会来的。
根据句③可知invite 的名词是invitation。

1. Mr. Green invited me _______ (visit) his factory last week.
2. Thanks a lot for your ________ (invite). But I have to stay at home to do my homework.
3.Thanks for________ (invite) me to your party.
to visit
invitation
inviting
即时练

He ______ me to come to his birthday party the day before yesterday.
A. invitation　　 B. invite　　
C. invited　　 D. invites
典型例题
答案：选C。
解析：句意为：前天他邀请我参加他的生日晚会。（1）invite sb. to do sth. “邀请某人做某事”是固定用法，由时间状语确定用一般过去时，故选C。（2）invite sb. to sp. 意为“邀请某人到某处”。
3c
Write down everything you have to do next week. Choose a day and time to have a party. Then invite classmates to your party.
A: Can you come to my party?
B: When is it?
A: Next week, on Thursday
night.
B: I’m sorry. I have to study
for a math test.
REVIEW
Invitation:
Can you come to my party …?
Acceptation:
Sure, I’d love to.
Yes, I’ d love to.
Declination:
I’m sorry, I can’t. I have to …
I’d love to, but I have to …
单项选择：
1. Joe ______ go to the doctor. His leg is broken.
A. have to　　 B. can　　
C. has to　　 D. may
2. — Can you help me with my English?
— Sure, ______.
A. I’d like　　　　　　 B. I’d love
C. I’d love to　　 　　 D. I have to
3. Thanks a lot for ______ me ______ your party.
A. invite; for　　　　 B. invite; to
C. inviting; for　　　 D. inviting; to
4. Sorry, I’m busy today. I have ______ homework to do.
A. much too　　　　　 B. too much
C. too many　　　　　 D. many too
句型转换：
1. I have to study for a test this evening. (改为否定句)
I ______ ______ ______ study for a test this evening.
2. They can go to the concert. (改为一般疑问句)
______ they ______ to the concert?
don’t have to
Can go
3. —Can Mary go to your birthday party? (作否定回答)
— ___________, she ______.
Sorry / No can’t
情景对话：
1. --- ______ you go to the mall this week?
--- Sure, I’d love ______.
2. --- ______ are you doing on Thursday
afternoon?
--- I am going to the doctor.
Can
What
to