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）
I wish I could do much better !
I hope I can do better.
I wish I could do better!
I wish I can do better!
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