zakaj

In a sentence

• Zakaj se smejiš?

  Why are you laughing?

  Here, 'zakaj' is used as a question word meaning 'why' to inquire about the reason for someone's laughter.

• Ne vem, zakaj je odšel.

  I don't know why he left.

  Here, 'zakaj' introduces a subordinate clause expressing the reason behind an action.

• To je razlog, zakaj sem prišel.

  This is the reason why I came.

  Here, 'zakaj' is used as a relative conjunction to connect the reason with the main clause.