同僚のお別れ会があり、会えないと思うと寂しくなったって英語でなんて言うの？

"同僚のお別れ会があり、会えないと思うと寂しくなった" - I became sad at my coworker's going away party after thinking about how I won't be able to see them anymore. 最後の日にお別れ会をして、もう会えなくなることを考えると寂しくなります。 - On my coworker's last day, we threw them a going away party and became sad about how I will no longer be able to see them.

この場合、次のような言い方ができますよ。 ーWe had a farewell party for one of our co-workers, and it made me sad to think I would never see him again. 「同僚のお別れ会があって、もう彼に会えないのだと思うと悲しくなった」 a farewell party「お別れ会」 co-workers「同僚」 ご参考まで！