现在进行时

　　I am writing a book.

　　The book is being written by me.

　　过去进行时

　　She was doing her homework.

　　Her homework was being done.

　　一般将来时

　　We will built a house.

　　A house will be built.

　　现在完成时

　　They have come up with a question at the meeting.

　　A question has been come up with at the meeting.