If I had been able to speak English fluently, I would have enjoyed conversations with people from overseas.
If I had been able to speak English fluently, I would have enjoyed conversations with people from overseas.
仮定法過去完了の文で、過去のことについて「〜だったら〜だったのに」と表現できます。
前半"If I had been able to ~~" (〜〜できたなら)で仮定して、後半で"I would have enjoyed~~"(楽しめただろうに=実際にはそうでなかった)となっています。
be able to ~: 〜できる
fluently: 流暢に
people from overseas: 海外からきた人たち
参考になれば幸いです。