I'm way ahead of you.
我都知道了。/我已经在做了。
A: We need snacks for the party.
我们需要派对上的零食。
B: I'm way ahead of you. I bought chips and soda last night.
我早就想到了，昨天晚上我就买好了薯片和汽水。

(I'm) All better.

我已经好了。
A: How do you feel after having the flu?
患流感后，你的身体怎么样了？
B: I'm all better. I am as healthy as I've ever been.
我已经好了，比任何时候都健康。