主动语句的宾语变被动语态的主语
主动语句的动词由主动变被动结构
主动语态的主语变被动语态的by 的短语
如
We speak Chinese.
变被动语态是
Chinese is spoken by us.
主动语态变被动语态，谓语动词必须是及物动，如:
他们去年在山上种了很多小树:。They planted lots of small yrees on.the hill last
year. 改为被动;语态:
Lots of trees were planted by them .lsxt .year.
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