Questions & Answers about On je vrlo ljubazan.
The sentence On je vrlo ljubazan literally breaks down as:
- On – he
- je – is (3rd person singular of biti = to be)
- vrlo – very
- ljubazan – kind, polite, nice (in behavior, towards people)
So word-for-word it is He is very kind/polite.
You must use je, because Croatian normally uses the verb biti (to be) in the present tense, unlike Russian (which often drops it) or some other Slavic languages.
- Correct: On je vrlo ljubazan. – He is very kind.
- Incorrect: On vrlo ljubazan. ✗
So je is obligatory here in standard Croatian.