Questions & Answers about Jesi li u vlaku?
Why does the word for train change to vlaku here?
Because it is in the locative case, which is used to talk about locations. The basic word for train is vlak. Since it is a masculine noun ending in a consonant, it gets the ending -u when it comes after the preposition u (in) to show where someone is.
We learned that both u and na are used for locations. Why do we use u for a train?
In Croatian, you use u when you are physically enclosed inside something with walls and a roof, like a building or a closed vehicle. Since you sit inside a train, it is u vlaku. You use na for open surfaces or open vehicles, like na biciklu (on a bicycle).
How does Jesi li work to ask a question?
Jesi is the full form of the verb for "you are", and li is a special little word used to turn a statement into a yes/no question. Together, they translate perfectly to "Are you?".
Could I start this question with the shorter word si instead of Jesi?
No, because si is a short verb form, and in Croatian, these short words are never allowed to be the very first word in a sentence. You must use the long form Jesi to start this question.
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