Questions & Answers about Dobro sam, a ti?
Where is the word for "I" in Dobro sam?
In Croatian, you often drop the subject pronoun (like ja for "I") because the verb already tells you who is doing the action. The word sam specifically means "I am", so adding ja isn't necessary unless you really want to emphasize it.
Why is the word order Dobro sam instead of Sam dobro?
This is because sam is a clitic, which is a short, unstressed word. Croatian has a strict rule that clitics must come in the second position in a sentence or clause. It needs a word to lean on, which is why it comes right after the first word, Dobro.
Why is a used for "and" here instead of i?
The conjunction a is used when you are switching focus to a new subject or showing a slight contrast. Since you are turning the question back to the other person (switching focus from "me" to "you"), a is the correct word. The word i is used just for adding things together.
Since we dropped the "I" earlier, why do we keep the "you" (ti) at the end?
We need ti here because it stands alone without a verb and provides contrast! In the first part, the verb sam showed exactly who we meant. In the second part, we are asking "and what about you?", so we have to use the pronoun to make the subject clear.