为什么shouldbe后要用过去分词Rememberwhatshouldberemembered,andforgetwhatshouldbeforgotten.Alterwhatischangeable,andacceptwhatisunchangeable.

Question

为什么 should be 后要用过去分词
Remember what should be remembered,and forget what should be forgotten.Alter what is changeable,and accept what is unchangeable.

Answer 1

这是情态动词后跟的被动语态形式.
被动语态的基本结构为：be + 过去分词；有时也可使用get + 过去分词的结构.
像主动语态一样,被动语态也有各种时态,如：
1.一般现在时态的被动语态:am/is/are +过去分词
The computer center (is cleaned) every day.
2.一般过去时态的被动语态:was/were +过去分词
A new computer center (was built) in our school last year.
3.一般将来时态的被动语态:will + be +过去分词
A new computer center (will be built) in our school next year.
4.过去将来时态的被动语态:would + be +过去分词
He told us that a new computer center (would be built) in our school the next year.
5.现在进行时态的被动语态:am/is/are + being +过去分词
A new computer center (is being built) in our school now.
6.过去进行时态的被动语态:was/were + being +过去分词
A new computer center (was being built) in our school at this time last year.
7.现在完成时态的被动语态:has/have + been +过去分词
Three computer centers (have been built) in our school so far.
8.过去完成时态的被动语态:had + been + 过去分词
Two computer centers (had been built) in our school by the end of last year.
9.含情态动词的被动语态:can/may/must/should…+be +过去分词
A new computer center (should be built) in our school.
你问的情况就是属于最后一种情况,但愿对你有所帮助.