7A     Unit 4  Hobbies
一、重点词组：
used to do,billions of, see sb. do/doing sth, from one...to another,notA but B,
as well as, all over the world, take photographs, for example, in the past, make friends, get excited, at the beginning of,grow up,in a second, take part in, think of, in a second

二、重点句型：
when I was young, I did not use to have much money.
I used to go outside every night to look at the stars.
Having photographs is important because people and places always change.
You can go with friends or, if you like, you can go alone.
I hope I can work with real planes when I grow up.

三、主要语法：
1. when 引导的时间状语从句
2. used to / did not use to

四、交际用语：
1. What about you?
2. That would be great.
3. Oh, that's a good idea.
4. I couldn't believe it.
5. Would you like to come?
6. By the way...

五、写作目的：
让学生学会根据所给信息表达自己的观点。

六、难点精析：
Reading Part
1. There are billions of stars in the sky... 天上有无数的星星
1）billions of 数以十亿计的，无数的
① 基数词+ hundred (thous