被动语态的形式是由“be 动词的过去分词”构成。be随着主语的人称，数，时态和语气的不同而变化。各种时态的被动语态形式如下：
1.一般现在时 am/is/are V(p.p)
人们利用电能运转机器。People use electricity to run machines.
→Electricity is used to run machines.
2.一般过去时 was/were V(p.p)
昨天我们在山坡上种了许多树。We planted many trees on the hill yesterday.
→Many trees were planted on the hill yesterday.
3.一般将来时 will/shall be V(p.p)
下星期我们将举行一场运动会。We will hold a sports meeting next week.
→A sports meeting will be held next week.
4.过去将来时 should/would be V(p.p)
6.过去进行时 was/were being V(p.p)
当我进厨房时，她正在做蛋糕。She was making a cake when I came into the kitchen.
→A cake was being made when I came into the kitchen.
7.现在完成时 have/has been V(p.p)
他已经结束工作了。He has finished his work. →His work has been finished.
8.过去完成时 had been V(p.p)
到上个月为止，他们已经把这本书翻译成了英语。
They had translated the book into English by the end of last month.
→The book had been translated into English by the end of last month.
9.将来完成时will have been V(p.p)
截止到明年年底学生将学会2000个单词。The students will have learned 2,000 words by the end of next year.
→2,000 words will have been learned by the end of next year.
10. 过去将来完成时would have been V(p.p)
他告诉我截止到明年夏天，布朗先生将已经教他们2年。He told me that Mr. Brown would have taught them for two years by the next summer.
→I was told that they would have been taught by Mr. Brown for two years by the next summer.
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