1.I didn’t realize the mistake until I grow up.(强调划线部分)

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7. unless you finish your homework

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B.按要求进行句型转换

6. because the job offered a good salary

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5. while we took a swim

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4. since he was eighteen years ago

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3. after we finished writing our term papers

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2.when they would begin to recycle cans and bottles

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1. although the weather was perfect

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3.高级句型结构训练

A,续写句子

例子：before she became a teacher

造句：she was a worker before she became a teacher.

4.first, what’s worse, in my opinion, besides, now

___1___ many middle school students are fat and there are reasons for it. Some eat too much met and too many snacks. Some sit too long but seldom exercise.

Getting fat has quite a few disadvantages. ____2_____, being fat makes it difficult for one to walk or move as others.

___3____, to be fat usually means to be weak, and it is easy for a fat person to suffer from many kinds of diseases. At the same time. A fat person gets tired easily, which decreases his study efficiency.

____4_____, to be fat is not a good thing for us middle students. We should try to eat less meat but more vegetables. ____5_____ we should try our best to take part in all kinds of sports. If so, we are sure to lose weight and stay healthy.