Not too much. Not a lot. I was just... Just the same old thing. Well, I'm...
などがあります。
How are you? How's it going? How are you doing?
これらはさっきのとちょっと違って"How are you?"ってコト。
なのでどんな状態なのか答えます。
Not bad. Pretty well./Pretty good. Not so well./Not so good.
What's new?
って聞かれてんのに
I'm fine.
はおかしいわけです。
逆も然り。
また会話を終える言い回しには下記のようなものがあります。
I've got to get going. Look at the time! I have to... It's getting late. I need to go home. I really should be running along. I've got to get back to work.