1I was making model planes when my mother came back.（对画线部分提问）
_______ _______ _______ _______ when your mother came back?
I think classical music is boring.（改为否定句）
I _______ _______ classical music is boring.
My mother was doing the dishes at that time.（同义句转换）
My mother was _______ the _______ at that time.
He read a story-book last night.（改为过去进行时）
He _______ _______ a story-book at eight o’clock last night.
He wasn’t old enough to go to school. (同义句转换)
He was _______ young_______ go to school.