问题补充：
句型转换
【小题1】He went to sleep after he finished his homework. (同义句转换)
He didn’t go won’t be to sleep until he finished his homework.
【小题2】There will be more trees and flowers in the city in five years. (否定句)
Thereso that How oftenmore trees and flowers in the city in five years.
【小题3】He got up early. He could catch the bus. (合并为一句)
He got up early so…that he could catch the bus..
【小题4】He reads English once a day. (对划线部分提问)
does he read English?
【小题5】He is too young to go to school. (改为否定句)
He is young he can’t go to school.
答案：
解析：
【小题1】根据He went to sleep after he finished his homework.可知他在完成作业后才去睡觉，可知此处是直到完成作业才去睡觉。not……until……直到……才……。 因此第一空用didn’t ，第二空用go。
【小题2】There will be 的否定形式是There won’t be，故第一空为won’t，第二空为be。
【小题3】He got up early. He could catch the bus. 的句意是他起得早，目的是能赶上公共汽车，前后表示目的状语，故用连词so that。
【小题4】根据once a day.一天一次，可知此处是对频率提问，用疑问词How often。
【小题5】too …… to太……而不能，因此此处用 结果状语so…that 。
