Вчера наша переписка в чате оказалась очень интересной.

Yesterday our chat correspondence turned out to be very interesting.

Breakdown of Вчера наша переписка в чате оказалась очень интересной.

• в: in
• вчера: yesterday
• интересный: interesting
• очень: very

Questions & Answers about Вчера наша переписка в чате оказалась очень интересной.

What nuance does оказалась have compared to just saying была?

Both оказалась and была can be translated as “was”, but they feel different in Russian:

• оказалась (from оказаться, perfective) = “turned out to be / ended up being”
  It usually implies:

  • some kind of result or outcome, and
  • often a shade of surprise or at least that the result was not fully expected.

• была (from быть) = the neutral “was”, simply stating a past fact, with no idea of discovery or surprise.

So:

• Вчера наша переписка в чате оказалась очень интересной.
  → Yesterday our chat correspondence turned out to be very interesting
  (we didn’t necessarily expect it; we realized it afterwards)

• Вчера наша переписка в чате была очень интересной.
  → Yesterday our chat correspondence was very interesting
  (plain statement of fact)

Both are correct; оказалась just adds that “turned out / as it happened” feeling.

Why is it интересной and not интересная at the end? What case is that?