Learn Italian: È la tua valigia, la devi spostare. - It is your suitcase, you must move it.

When you have a modal verb (like devi, you must) followed by an infinitive verb (like spostare, to move), you have a choice of where to put the object pronoun. You can place it before the conjugated modal verb (la devi spostare), or you can attach it to the end of the infinitive. Both are completely correct and mean the exact same thing.

If I wanted to attach la to the end of the verb instead, how would I spell it?

You would drop the final -e from the infinitive spostare and attach the pronoun directly to the end, making it a single word: devi spostarla.

How do we know the pronoun la means "it" here?

La is a direct object pronoun that replaces a feminine singular noun. Because the first half of the sentence is about la valigia (the suitcase, which is feminine), we use la to say "it" when referring back to that specific object.

Why do we say la tua valigia instead of just tua valigia?