问题
句型转换
句型转换
1. I was making model planes when my mother came back.(对画线部分提问)
_______ _______ _______ _______ when your mother came back?
2. I think classical music is boring.(改为否定句)
I _______ _______ classical music is boring.
3. My mother was doing the dishes at that time.(同义句转换)
My mother was _______ the _______ at that time.
4. He read a story-book last night.(改为过去进行时)
He _______ _______ a story-book at eight o'clock last night.
5. He wasn't old enough to go to school. (同义句转换)
He was _______ young_______ go to school.
答案
1. What were you doing
2. don't think
3. washing; dishes
4. was reading
5. too; to
为石蕊变色后又褪色的原因是由于试管不干净，含有其他杂质造成的，要证明小明的观点，应进行的操作是 。