转换成被动语态1.you should turn off the lights after class.2.we must plant more trees.

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转换成被动语态1.you should turn off the lights after class.2.we must plant more trees.
转换成被动语态1.you should turn off the lights after class.2.we must plant more trees.

转换成被动语态1.you should turn off the lights after class.2.we must plant more trees.
The lights should be turned off after class.
More trees must be planted by us.

被动句The lights should be turned off after class.
More trees must be planted by us.