This is the 518th most frequent Croatian word.
zašto
"Zašto" means "why" in English.
In this sentence, 'zašto' is used to directly ask about the reason for someone's tardiness.
Zašto kasniš na sastanak?
Why are you late for the meeting?
Here, 'zašto' introduces the clause describing the reason that is being wondered about.
Pitam se zašto je otišla tako rano.
I wonder why she left so early.
'Zašto' in this sentence is used to question the reason behind someone's thought.