Learn Italian: Non ti muovere! C'è un orso! - Don't move! There is a bear!

In Italian, when you tell someone not to do something (a negative command) using the tu (informal "you") form, you always use non plus the infinitive of the verb. So, "Don't move!" is Non ti muovere!, not Non ti muovi!.

Could the pronoun ti go somewhere else in Non ti muovere?

Yes! With negative commands in the tu form, you have a choice. The reflexive pronoun ti can go before the verb (Non ti muovere!) or it can attach to the end of the infinitive, dropping the final "e" (Non muoverti!). Both are completely natural and mean exactly the same thing.

Why do we need the pronoun ti here at all? Can't I just say Non muovere?

If you just say Non muovere, it usually means "Don't move (something else)," like a piece of furniture or an object. Because you are telling the person not to move their own body, Italian uses the reflexive verb muoversi. The ti shows that the action reflects back onto the person you are talking to.

Since orso (bear) starts with a vowel, shouldn't it be written as un'orso with an apostrophe?