什么时候用be done 什么时候用to be done
3个回答

前者出现的情况如will be done,must be done 等,前有情态动词,其它的be要用具体的,如is/are/was/were done

如The work will be finished.工作将要完成.

The plan must be carried out.计划务必执行

The clothes were washed.衣服洗了.

后者是不定时的被动式,

如That remains to be seen.那件事不得而知.

My car needs to be repaired.我的车要修理