če

In a sentence

• Če se boš učil, boš uspešen.

  If you study, you will be successful.

  In this sentence, 'če' is used as a conditional clause introducing the condition for the outcome described in the main clause.

• Vprašal me je, če vem, kje je ključe.

  He asked me if I know where the keys are.

  Here, 'če' functions as a conjunction introducing an indirect yes-or-no question.

• Čeprav je zunaj deževno, bomo šli na sprehod.

  Although it's rainy outside, we will go for a walk.

  In this case, 'če' is part of the word 'čeprav', forming a concessive conjunction indicating a contrast.