i wish i could have seen the ballet .
问题描述：
i wish i could have seen the ballet .
.i am sure it would have been a pleasant memory in the trenches.这两句话各是什么时态?
答
两句都是虚拟语气.第一句为我希望我能看到那场芭蕾.（意思为之前没看到,只是希望.)
第二句为 我确信在战壕里的记忆是美好的（这是对过去事情的推测）.那是什么时态？时态的句型由什么构成？属于过去将来完成时，句型为should/would+have+done的结构。有两种含义。1，表推测，I thought you'd have left by this time.我想这会儿你已经走了。2，表希望，you should've achieved that. 你本来能做到的。（其实没做到.)