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(主动语态) （被动语态）
The London smog killed 12000 people.
The London smog
killed
12000 people
were killed
by the London smog.
Why do we use the passive voice?
歌诀：谁做的动作不知道，说出谁做的没有必要，
动作承受者需强调，被动语态运用到。
After the smog
1. About 12 000 people_________ by the smog.(kill)
2. Food in the shop_________out.(sell)
3. The water____________by the smog. (pollute)
4. Clean Air Act(清洁空气法案)______________by
the government. （carry out）
were killed
was sold
was polluted
was carried out
Was/were
一般过去时的被动语态
was /were + 过去分词
was
were
was
过去分词
Now
tianjin
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