主動= He loves her
被動= She is loved by him
形式 主動：V 被動：Be＋p.p.
現在簡單式 He finishes it. It is finished.
現在進行式 He is finishing it. It is being finished.
現在完成式 He has finished it. It has been finished.
過去簡單式 He finished it. It was finished.
過去進行式 He was finishing it. It was being finished.
過去完成式 He had finished it. It had been finished.
未來簡單式 He will finish it. It will be finished.
未來完成式 He will have finished it. It will have been finished.
I saw him enter the room.
=He was seen to enter the room.（我看見他走進這房間。）
不完全及物動詞（如call, elect, choose, appoint…）改為被動語態時，不可以用補語作主詞，仍要用受詞作主詞。
We elected him chairman.
He was elected chairman (by us).（我們選他為主席。）
被動＝Let＋受詞＋be＋p.p. Do it at once.（立刻做它。）
Let it be done at once.