kad

In a sentence

• Kad idem u školu, prolazim pored parka.

  When I go to school, I pass by the park.

  In this sentence, 'kad' acts as a subordinating conjunction introducing a temporal clause, equivalent to 'when'.

• Nisam siguran kad ćemo krenuti.

  I am not sure when we will start.

  Here, 'kad' is used as a question word, introducing an indirect question related to time.

• Sjećaš li se kad smo prvi put otišli na more?

  Do you remember when we first went to the sea?

  In this instance, 'kad' functions as a question word within a dependent clause, referring to a specific point in time.