conversation可數嗎?

　　conversation雙語例句：

　　I'm learning English conversation.

　　我正在學英語會話。

　　None of them can carry out even the simplest conversation in the foreign language they have been learning.

　　他們當中沒有誰能用所學的外語進行即便（是）最簡單的會話。

　　I had a long conversation with her the other day.

　　前幾天我與她作了一次長談。

　　The main topic of conversation was Tom's new girlfriend.

　　交談的主要話題是湯姆的新女友。

　　Don was deep in conversation with the girl on his right.

　　唐與他右邊的女孩在專心交談。