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was/were + done
The Passive Voice
We are facing our final exam.
How much do you know about the passive voice?
Parents encourage us.
主
谓
宾(承受者)
We
are encouraged
by
parents.
宾变主,主变宾,前加by
动变被,看清be, 结构分别be+ done
被动语态
主动语态
（执行者）
被动语态出现的必要性
water, pollute
The water is seriously polluted.
fish, make, die
Fish were made to die of illness.
pollution, cause, rubbish
rubbish, throw away carelessly
Most pollution is caused by rubbish.
Rubbish is thrown away
carelessly.
animals, die out
Animals are dying out.
不用被动语态