情态动词被动语态例句
问题描述：
情态动词被动语态例句
答
It should be let down
答
sth can't(can/may/shouldn't...) be done.
应该就是这样的句式吧
答
We should plant many trees on the mountains．我们应该在山上种许多树.Many trees should be planted on the mountains． 应该在山上种许多树.Teenagers should be allowed to go out with their friends.应该允许...