第一个表示将来完成时态
比如may be i will have done those work when you arrive here(说不定等你来的时候我都把这些工作做完了.)
第二个是虚拟语气的过去完成时态,表示我本该做完什么却没能完成.
如：if you came yesterday,i could have finished the work.
如果你昨天来了,或许我就做完那些工作了.
will have done could have done 这是什么结构啊 是过去完成时吗
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