Learn Croatian: Gdje su novi hoteli? - Where are the new hotels?

Hotel is a regular masculine noun. To make it plural when it acts as the subject of the sentence (the nominative case), you just add the ending -i. That gives us hoteli.

Why is the adjective for new written as novi?

In Croatian, adjectives must match the gender and number of the noun they describe. Because hoteli is a masculine plural noun, the adjective takes the masculine plural ending -i, making it novi.

Why does su come right after Gdje?

The word su (are) is a type of word called an enclitic. Enclitics are unstressed words that cannot start a sentence and almost always jump into the second position. Here, the first position is taken by the question word Gdje, so su must take the second spot.

What is the dictionary form of the verb su?

Su is a form of the verb biti (to be). Specifically, it is the third-person plural form (they are), which we use here because the subject, hoteli, is plural.