8. I have to study for my science test on Thursday.

have to强调客观原因；而must强调主观原因　 have to　 否定形式 don’t / doesn’t / didn’t have to /　 have not to 9. Please keep quiet ! I’m trying to study .

try to do sth. 表示“ 尽力做某事 ” , 不包含是否成功的意思

7. On Wednesday, I’m playing tennis with the school team.

6. Come and have fun . / Come and join us .

5. Thanks for asking . for介词，后跟名词，代词或动名词　 　Thank you for inviting me

4. Maybe another time .

3. That’s too bad .

2. I have too much homework this weekend .

too much后跟不可数名词；too many后跟可数名词复数

1. (表示能力、功能)能,会 　　The classroom can seat thirty students. 这教室能坐三十位学生。 　　

June can drive now. 琼现在会开车了。 2. (表示可能性)可能,可能会 　I think the work can be completed ahead of time. 我认为这项工作能提前完成。 3. (表示允许、请求)可以 　　　You can't take the book out of the room. 　你不可以将这本书拿出室外。 　　　　　　　　　　　　　 Can I use your pen? 我可以用一下你的笔吗? 4. (表示命令)必须 　　　　　　If you won't keep quiet you can get out. 　你如不保持安静,就请你走。 5. (表示偶然发生的可能性)有时会 It can be quite windy there, especially in spring. 那里有时容易刮风,特别在春季。 6. (表示惊讶)究竟;竟至于 　　What can it possibly be? 　到底那是怎么一回事? n. 1. (食物)罐头 　2. 金属容器

情态动词can在这里起征求对方意见的作用。 Can you play tennis with me ?

⑵ 　　can 和 be able to 的用法区别

1)can　could 表示能力；可能 (过去时用could), 只用于现在式和过去式(could)。be able to可以用于各种时态。表示现在或过去能力时两者可以互换。　 They will be able to tell you the news soon. 他很快就能告诉你消息了。 2)只用be able to 　 a. 位于助动词后。 b. 情态动词后。 c. 表示过去某时刻动作时。　 d. 用于句首表示条件。

　e. 表示成功地做了某事时，只能用was/were able to， 不能用could。 　　He was able to flee Europe before the war broke out.　 = He managed to flee Europe before the war broke out.　

3)be able to 可以接在不定式后，而看不能　 I hope to be able to go to the movies with you on Sunday.

4)　 be able to 的过去式还表示经过努力而做到，而could 无此意。 He studied hard and was able to pass the exam.

5)　 当表示猜测，轻轻和允许时，只能用can，不能用be able to .　 He can’t be at home now. 他现在不可能在家

⑶　 　sure 的用法　 常用于口语中，作为说话人较有把握的肯定回答，相当于 certainly 或 yes

be sure to do sth　 一定会做某事　 He is sure to come here.

be sure of sth　　 对某事有把握　　 She is sure of success.

be sure that　 肯定……　　　　　 I’ m sure that he will come.

feel sure= be sure确信 　　　make sure 弄明白,查明白 　　make sure of 尽力做到,将...弄明白,保证

1.--- Can you come to my party ?

---Sure , I’d love(like) to . / I’m sorry , I can’t . I have to help my parents .

⑴ 　情态动词can的用法

2.　　 Line up the activities your family will do tomorrow.