B. 阅读对话，完成下列任务。
Ms. Li:Good morning, everyone. Today’s theme is “Our Great Changes in Junior High”. Let’s start the sharing. Tom, did you use to be quiet in Grade 7?
Tom:Yes, I did. I used to be very shy and afraid to speak in class.
Lucy:Oh, that’s true! You used to sit in the corner alone in every class, right? And you didn’t use to take part in any of our group activities.
Tom:Yeah! I just kept silent and listened to others at that time. But now I’m really outgoing. What about you, Lucy? Did you use to hate sports?
Lucy:No, I didn’t. But I used to be very weak and couldn’t run fast at all.
Lily:I still remember that clearly! You used to fail the 800-meter running test every time and cry because of it.
Lucy:Haha, that’s me in Grade 7! Now I keep exercising every day, and I can run very fast in P. E. class. Lily, you used to have long hair, didn’t you?
Lily:Yes, I did. I used to keep long straight hair for nearly two years, but it was too troublesome(麻烦的) to take care of, so I cut it short last term.
Tom:Wow, your short hair is really nice on you! And I remember you used to hate math so much, right? But now you’re our math monitor!
Lily:Thank you! You’re right. I didn’t use to understand math problems well, so I used to ask you for help after class. Now I fall in love with math.
Ms. Li:That’s wonderful! All of you have changed so much these years. None of you used to be confident enough to share in front of the class, but now you all dare to talk about your growth bravely.
Together:Thank you, Ms. Li. We really grow up little by little with your help!
任务一:在对话中用“”标出 used to 的肯定形式、否定形式和疑问形式。
任务二:观察对话中出现的 used to 的语法规则,补全表格。

任务一：在对话中用下划线标记上述列出的所有含used to的相关内容即可。
任务二：
1. 过去常常发生的动作或过去存在的状态（现在该动作不再发生、该状态已不存在）
2. 动词原形
3. used to + 动词原形
4. didn't use to + 动词原形（也可写usedn't to + 动词原形）
5. Did
6. use to + 动词原形

任务一：需要从对话中定位所有used to的不同形式，标记内容如下：
1. 疑问形式：Tom, did you use to be quiet in Grade 7?
2. 肯定形式：I used to be very shy and afraid to speak in class.
3. 肯定形式：You used to sit in the corner alone in every class, right?
4. 否定形式：And you didn't use to take part in any of our group activities.
5. 疑问形式：Did you use to hate sports?
6. 肯定形式：But I used to be very weak and couldn't run fast at all.
7. 肯定形式：You used to fail the 800-meter running test every time and cry because of it.
8. 肯定形式：Lily, you used to have long hair, didn't you?
9. 肯定形式：I used to keep long straight hair for nearly two years
10. 肯定形式：And I remember you used to hate math so much, right?
11. 否定形式：I didn't use to understand math problems well
12. 肯定形式：so I used to ask you for help after class.
13. 肯定形式：None of you used to be confident enough to share in front of the class
任务二：结合对话例句归纳used to的语法规则：used to是描述过去和现在差异的常用结构，专门指代过去经常发生的动作、过去存在的状态，且该动作/状态现在已经不复存在，结构后必须接动词原形，对应肯定、否定、疑问形式都可以从对话的实际用例中总结得出。