Well, are you excluding alternate phrasings like がある?

Depends on the sentence, I guess.

I can think of ways to say what I want to say naturally, I'm just not sure if this feels weird to me because it's wrong or because I'm wrong.

When I was starting out I always had issues with relative clauses that would have had a dangling preposition in English not having anything in Japanese, and similarly with clefting. I feel like this might just be that issue cropping up again, but am not sure.

(In case it helps, an example: 事務所にいる時、仕事に夢中だ。 ⇒ 仕事に夢中であるのは事務所にいる時だけだ。)

Maybe because you would usually use 夢中になっている?

.. I think

any one on the board?

@Xeo can you help me with something

@Chris Hm?

Maybe

Nono. Virtual bits are here!