They are going to be given a difficult test.

一般过去将来时：should(would) be+过去分词

e.g. The teacher said the results would be published soon.

He told me that the film would be shown the next week.

现在进行时：am/is/are + being +过去分词

e.g. The new airport is being built by a foreign company.

一家外国公司正在承建这座新机场。

The song is being sung by the girls now.

过去进行时：was/were being+过去分词

e.g. The song was being sung by the girls when I got there.

The student was being criticized when I went into the

teacher's office.

将来完成时：will have been+过去分词

e.g. By the end of next term 2000 English words will

have been learned.

The building will have been built by next year.

现在完成时：has/have + bee n +过去分词

e.g. All the tickets have been sold .

The book has been translated into many languages.

这本书已被译成多种语言。

过去完成时：had been+过去分词

e.g. Forty schools had been visited by last year.

All the tickets had been sold out when I got to the cinema.

过去将来完成时：would have been+过去分词

e.g. He said many words would have been learned by 2001.

They promised that ten books would have been published

by the next month.

情态动词：情态动词 + be + 过去分词

e.g. This road must be mended.

The machine parts may be needed in our work.