I'm going to Harvard.

我要去读哈佛大学。

That's easy for you to say.

你可以轻松地说。

You could go too, if your grades were better.

如果你的成绩好一点，你也可以去。

That's wishful thinking.

那是一个梦想。

wishful adj.怀有希望的，表达愿望的