talk的过去式和过去分词是什么啊

　　We're talking  500 for three hours' work.

　　咱们讲的可是工作三个小时酬金500英镑。

　　Talking about my problems doesn't come easy to me.

　　要讲关于自己的问题，对我来说并不容易。

　　We won't talk about that ─ that's history.

　　我们不会谈论那件事的——那都已经过去了。