Students should be allowed to watch TV.
sth should be done.
should students be allowed to watch TV?
Students shouldn't be allowed to watch TV.
The book has been written.
sth has been done.
Has the book been written?
The book hasn't been written.
It's being cleaned.
sth is being done.
Is it being cleaned?
It is not being cleaned.
追问还有前三个 1英语被使用 2这本书被写 3他将被教
追答English is used.
sth is done.
Is English used?
English isn't used.
This book is written.
sth is done.
Is this book written?
This book isn't written.
He will be teached.
sb will do sth.
Will he be teached?
He will not be teached.