How do you say the two are talking in mandarin?

There are a few ways to say "the two are talking" in Mandarin, depending on the context and formality:

Formal:

* 他们两个人正在谈话 (tāmen liǎng ge rén zhèngzài tán huà) - This literally means "the two people are talking."

* 两人正在交谈 (liǎng rén zhèngzài jiāo tán) - This means "the two are engaging in conversation."

Informal:

* 他们俩在聊天 (tāmen liǎ zhài liáo tiān) - This means "the two of them are chatting."

* 他们两个在说话 (tāmen liǎng ge zài shuō huà) - This means "the two of them are talking."

Other options:

* 他们正在对话 (tāmen zhèngzài duì huà) - This means "they are having a dialogue."

You can choose the most appropriate phrase based on the context and the formality of the situation.