含情态动词的被动语态: can\ may\ must\ should + be + 动词的
过去分词The flowers should be watered every day. 每天应该浇花。
Cars mustn't be parked here. 这里禁止停车。
Children can be taken to the cinema free on Children's Day.
儿童节孩子可以免费进电影院。
Teenagers should be allowed to go out with their friends.
应该允许青少年和朋友外出。
Many trees should be planted on the mountains.
应该在山上种许多树。
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不明白的再问哟,请及时采纳,多谢!