I wish I could, but I have no time tomorrow我希望可以，但我明天没空。

今天的几个句子还是有关表达意愿的：1. Count me out. 我就算了吧。表示自己不愿加入时使用。2. I don't think I will. 我不愿意。用于比较随意的场合。如：A: Do you want to go with us?   B: I don't think I will.;