翻译：等你做完后再继续谈

邮件中一般用:discuss later

如果是邮件中,我觉得以下句子均可.
We can discuss this matter after you done it.
We can continue this matter later.
We can continue this matter after you done it.
We can continue our discussion later.

联系上下文看语境.

We will go on the the discussion after you finish it.

再继续谈:go on the discussion/talking/negotiation.

We'll continue to talk after you finish it.
用go on代表继续也可以