以助动词do为例
1.一般现在时：主动：do/does 被动：am/is/are done
2.一般过去时：主动：did 被动：was/were done
3.一般将来时：主动：will/shall do 被动：will/shall be done
4.现在进行时：主动：am/is/are doing 被动：am/is/are being done
5.现在完成时：主动：have/has done 被动：have/has been done
6.含情态动词：主动：情态动词+do 被动：情态动词+be done
英语中的情态动词：would /should/could/might/must等等.