Hola Lyn

You can say "Debes recoger tu cuarto" or "Debes ordenar tu habitación". Both are correct; recoger and ordenar are synonyms and the same goes for cuarto and habitación.

But note that your sentence is saying "Debes ordenar su cuarto"; you must match the conjugation with the possessive. The correct possessive here should be "tu", not "su", as you are using the you informal conjugation. If you want to make this sentence more formal you could also say "(Usted) debe ordenar su cuarto."

Gracias y saludos

Inma

Hi Alexander,

may/might can be expressed in different ways in Spanish. Most of the time we don't actually use modals. Here are some examples:

"He may come tonight":

1. A lo mejor viene esta noche. 2. Quizás venga esta noche. 3. Puede que venga esta noche.

"I might marry him."

1. A lo mejor me caso con él. 2. Quizás me case con él. 3. Puede que me case con él. 

We don't usually make a distinction between may and might.

Inma :))