"She is safe in the bed."

Translation: Hun er trygg i sengen.

[ZorbaTHut]

Is sengen/senga an irregular conjugation of "the bed", or is something else going on that I don't understand?

[unwallflower]

It's not irregular. It's "senga" if you're choosing to use the feminine form (ei seng), and it's "sengen" if you're choosing to to always use the masculine form (en seng).

[ZorbaTHut]

Ahh, got it! Thanks :)

[BenConway6]

Det er godt å vite.

[Lhale783]

Here, is the gender of the adjective based on the girl?

[BenConway6]

No, trygg is both male ans female. It would only change in the neuter form where it would be trygt.

[Lhale783]

I more meant the gender is in reference to that instead of the bed. So if it was say 'bordet' would it remain as 'trygg' or would it then become neuter?