Questions & Answers about Da je danas ljeto, plivali bismo na plaži.
In this sentence, da je danas ljeto means “if it were summer today” – something contrary to reality (it is not summer today).
- da je here introduces an unreal/irrealis condition (similar to English “if only it were / if it were”).
- ako je normally introduces a real or possible condition (“if it is/if it will be”), like:
- Ako je danas ljeto, plivat ćemo na plaži. – If it is summer today, we will swim at the beach. (a real possibility)
So:
- Da je danas ljeto, plivali bismo… ≈ If it were summer today, we would be swimming… (imaginary)
- Ako je danas ljeto, plivat ćemo… ≈ If it is summer today, we’ll swim… (real/unknown)