人教版八年级英语上册《Can you come to my party?》SectionA PPT教学课件(第3课时)，共36页。
Objectives
To learn to use “Can you/he/they…?”to make invitations.
To use the following structure to talk about obligations: I might have to/must…
To learn how to communicate with others politely.
Review
Hey, Anna, can you come to my birthday party on Saturday? …
Oh, Sam! I remember we went bike riding last fall when …
Can you play chess with me tomorrow afternoon?
Sure. I’d love to.
I’m afraid not. I have the flu.
Grammar Focus
Can you come to my party on Saturday?
Sure, I’d love to./Sorry, I must study for a math test.
Can you go to the movies tomorrow night?
Sure. That sounds great.
I’m afraid not. I have the flu.
Can he go to the party?
No, he can’t. He has to help his parents.
Can she go to the baseball game?
No. she’s not available. She must go to the doctor.
Can they go to the movies?
No, they’re not free. They might have to meet their friends.
情态动词主要有：may/might, can/could, must, have to, shall/should, will/would, ought to, need, dare, used to
现在我们来着重学习情态动词can 以及
have to 的用法。
其特征主要有：
情态动词 can 的基本用法
1. 情态动词 can 有一定的词义，但不能独立存在，它必须与动词原形一起构成谓语。情态动词 can 没有人称和数的变化。其具体用法如下:
表示“能、会”指脑力或体力方面的“能力”。如:
► I can speak Japanese. 我会讲日语。
► Frank can swim but I can’t. 佛兰克会游泳, 但我不会。
2. 表示“可能”，常用于否定句或疑问句中，指某种可能性。例如：
► My cousin can’t be in this city. He is in Korea now.
我堂兄不可能在这个城市里。他在韩国呢。
► Can he come to our club today, please?
请问他今天能来我们俱乐部吗？
3. 表示“可以”，常用于口语中，指许可或请求做某事
► Can I ask you a question? 我可以问你一个问题吗？
► You can bring something to eat. 你可以带些吃的。
can为情态动词, 在本单元中表示请求，用于发出邀请，后跟动词原形。当同意接受对方的邀请时，常用Sure, I’d love to. / Certainly. /Of course.等来回答；若不接受，常用Sorry等来有礼貌地拒绝，一般情况下需要说明不能接受邀请的原因以表示歉意。
► —Can you come to my birthday party tomorrow？
明天你来参加我的生日聚会，好吗？
—Sorry, I can’t. I am going to visit my grandpa.
很抱歉，我来不了，我要去看我爷爷。
have to 的用法
1. have (has) to + 动词原形
have (has) to 后面要用动词原形。当主语为第三人称单数时用 has to，当句子是过去时用 had to。
► We have to go home now.
我们不得不现在就回家。
► He has to work on Sunday.
他不得不在周日工作。
► I had to do much housework last Sunday.
上周日我不得不做很多作业。
2. have to 的否定句句型：
主语 +don’t/didn’t/doesn’t won’t +have to + 动词原形
► You don’t have to walk so fast.
你不必走那么快。
► He will not have to buy a new coat next year.
明年他没必要买新外衣了。
3. have to 的疑问句句型：
Do/Does/Did/Will + 主语 + have to + 动词原形
3. have to的意思是“必须、不得不”, 往往强调由于客观原因
而必须做某事。 have to 后接动词原形；have to有人称、数和
时态的变化, 其第三人称单数形式为has to, 其疑问形式和否定
形式要借助于助动词do或does来完成。例如：
► We have to look after our sister at home.
我们不得不在家照顾我们的妹妹。
► Does he have to get up early tomorrow morning?
明天早上他必须早起吗？
► I don’t have to stay at home today. 今天我不必待在家里。
Homework
Write an invitation based on the following information.
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