题目：
句型转换。
1. Yesterday mother bought me a computer.(改为同义句)
Yesterday mother _____a computer _____ _____.
2. The students do some cleaning on Saturday.(对画线部分提问)
_____ _____ the students do _____ cleaning?
3. John has gone to school．(用by the time改写)
John _____ _____ to school by the time I called him.
4.I was late for school because my alarm clock didn't go off.(对画线部分提问)
_____ _____you late for school?
5. By the time I got up, my brother had taken a shower.(对画线部分提问)
What _____ your brother _____by the time you got up?
答案：
1. bought; for me
2. When do; some
3. had gone
4. Why were
5. had; done
