她花几个小时在电话上和朋友们聊天。

She spends hours on the phone ___chatting to her friends.

我们只是在聊上个周末做了什么。

We were just ___chatting about what we did last weekend.

每当我走进去，我总是发现他们两个在不停地聊天。

Whenever I walk in, I always find the two of them ___chatting away.