Please enter banners and links.

conversationは、可算名詞にも不可算名詞にもなる名詞です。使用例をみておきます。

 

(11:10) You know, it used to be that in order to have a polite conversation, we just had to follow the advice fo Henry Higgins in “My Fair Lady”: Stick to the weather and your health. 【可算】

(10:14) A conversation requires a balance between talking and listening, and somewhere along the way, we lost that balance.　【可算】

(9:12) Is there any 21st-century skill more important than being able to sustain coherent,confident conversation?　これは、sustain a conversation（会話を続ける　参照：ALC.COM)という言い方があることから、単にうっかりaが落ちただけかもしれません。後から推敲される文章ではないので、こういうことは起こると思います。

(8:54) I talk to people that I like. I talk to people that I don’t like. I talk to some people that I disagree with deeply on a personal level. But I still have a great conversation with them.

(7:43) We’ve all had really great conversations. 【可算】

(7:25) So I have 10 basic rules. I’m going to walk you through all of them, but honestly, if you just choose one of them and master it, you’ll already enjoy better conversations. 【可算】

(6:45) If you want to get out of the conversation, get out of the conversation.　【定冠詞】

(6:23) You need to enter every conversation assuming that you have something to learn. 【可算】

(4:30) We’re sitting there having a conversation with someone.  【可算】

(3:20) Conversations are not a promotional opportunity.【可算】

(3:06) Especially in work conversations or in conversations with our kids, we have a point to make, so we just keep rephrasing it over and over. Don’t do that.【可算】

(1:39) It takes effort and energy to actually pay attention to someone, but if you can’t do that, you’re not in a conversation. 【可算】

(1:06) A good conversation is like a miniskirt; short enough to retain interest, but long enough to cover the subject.

Celeste Headlee TED 10 ways to have a better conversation

不可算名詞として使われている例も見ておきます。熟語・慣用句になっている場合が不可算が多いのかもしれません。
get [fall] into conversation〈会話を〉・話を始める　（参照：Weblio)
fall into conversation 【意味】to start having a conversation with someone, especially someone you have just met（参照：macmillandictionary.com）
in conversation with 《be ～》～と談話中である （参照：ALC.COM)
sustain a conversation　会話を続ける　（参照：ALC.COM)
以下、ウェブ記事RECLAIMING CONVERSATIONからの用例。
We live in a technological world in which we are always communicating and yet we have sacrificed conversation for mere connection. We turn away from each other and toward our phones.　【不可算】
So the case she makes for the decline of conversation in our digital age is not merely her opinion; the research is solid and her analysis of the declining capacities for solitude, empathy, and engagement with the “messiness” of reality is careful and comprehensive. 【不可算】
 If we think we might be interrupted, we keep conversation light, on topics of little controversy or consequence.  And conversations with phones on the landscape block empathic connection.　【不可算】および【可算】
The distraction, comfort, and efficiency of technology won’t allow conversation to do the work it can do. 【不可算】
このウェブ記事の文章中にはたくさんconversationという単語が使われているので、可算と不可算の使い分けを考える材料になります。
具体的な状況を想定した会話は可算、抽象的な名詞として使われたときは不可算という区別だと思います。