Jos hissi olisi täynnä, voisin käyttää portaita.

If the elevator were full, I could use the stairs.

Breakdown of Jos hissi olisi täynnä, voisin käyttää portaita.

• olla: to be
• täynnä: full
• voida: can
• jos: if

Questions & Answers about Jos hissi olisi täynnä, voisin käyttää portaita.

What is the function and meaning of jos in this sentence?

jos is a conjunction meaning if. It introduces the conditional clause (protasis) that describes the hypothetical situation.

Why are olisi and voisin in the conditional mood?

The sentence describes an unreal or hypothetical scenario. In Finnish, you express such situations by putting both the “if” part and the result part in the conditional mood. Thus olisi = “would be” and voisin = “could (would be able to)”.

How do you form the conditional mood for verbs like olla and voida?

1. Take the present-tense stem:
   • olla → ole-
   • voida → voi-
2. Insert the conditional marker -isi-:
   • ole + isi → oleisi-
   • voi + isi → voisi-
3. Add personal endings:
   • olisi (3rd sg.), olisin (1st sg.)
   • voisin (1st sg.), voisit (2nd sg.)

What case is portaita, and why is it used instead of the nominative portaat?