这个是将来完成时态的形式啊,用于表示：将来能完成的事情,将来已经做了某事.would have done的确是用于虚拟语气的,而且是表示对过去的虚拟,主句用would have done,从句用过去完成时态.
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will have done 一般与什么时间状语连用?我只知道它在虚拟语气中用would have done 的形式.
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