句型转换。
The boys used to go fishing by the river. （改为一般疑问句）
_______ the boys _______ to go fishing by the river?
He is very young. He can’t go to school. （合并为一句）
He is _______ young _______ go to school
I was making model plans when my mothercame back(对划线部分提问)
_______ _______ _______ _______when your mother came back?
I think classical music is boring.(改为否定句)
I ___________ _________ classical music is boring.
He read a story-book last night(改为过去进行时态)
He ____ _____a story-book at eight o’clock last night.