Learn Croatian: Hladno je, zatvorite prozor. - It is cold, close the window.

Zatvorite is the formal or plural command form. You would use this when speaking to multiple people, or politely to one adult you do not know well. If you were talking to a close friend or family member, you would use the informal singular command zatvori.

How do we build the command form zatvorite?

It comes from the verb zatvoriti (to close). To make the command, we drop the -ti from the dictionary form to get the base zatvori. Since we want the plural or formal version, we add -te to the end, making it zatvorite.

Why is the word for "it" missing in hladno je?

In Croatian, you do not need a filler subject like "it" for weather or general conditions. You just use the describing word (like hladno) plus je (is). So, hladno je is all you need to say "It is cold".

Prozor is the object being closed. Why does its ending stay the same?

Prozor (window) is a masculine noun. In Croatian, when a masculine noun receives an action, its ending only changes if it represents a living thing, like a person or an animal. Because a window is not alive, prozor stays exactly the same as its dictionary form.