i wash i could fly为什么是过去式？

回答如下：

这个wash应该改成wish。动词wish(希望)后跟宾语从句时，要必须用虚拟语气，即表示现在的情况用过去时，be动词用were; 表示过去的情况用过去完成时; 表示未来的情况用would / should / could / might +动词原形。例如：

I wish I were a bird.

I wish I hadn't done it yesterday.

We wish he could finish it.

He wishes his mother would be back soon.