1. The car is made in China.
否定句：The car isn't made in China.
一般疑问句：Is the car made in China?
2. He was laughed at by us.
否定句：He wasn't laughed at by us.
一般疑问句：Was he laughed at by you?
3. The work will be finished tomorrow.
否定句：The work won't be finished tomorrow.
一般疑问句：Will the work be finished tomorrow?
4. My homework has been done by me.
否定句：My homework hasn't been done by me.
一般疑问句：Has your homework been done by you?
5. The book can be returned in five days.
否定句：The book can't be returned in five days.
一般疑问句：Can the book be returned in five days?