可以用wish\hope\expect等词表达：
I wish （that） i could do better.(注意用虚拟语气,因为这是一种愿望不是现实)
I hope (that) i could do better.
I expect (that) i could do better.
I expect to do better.（注意只有expect后面能跟不定式,上面两个不行）