Formal:
* Παρακαλώ (parakaló): This is the most common and versatile expression, similar to "please" or "if you please."
* Σας παρακαλώ (sas parakaló): This is the formal version of "parakaló," used when addressing someone with respect.
Informal:
* Σε παρακαλώ (se parakaló): This is a more informal version of "parakaló," used when addressing someone you know well.
* Παρακαλούμε (parakalούμε): This is a more informal version of "parakaló," used when asking a group of people.
Other options:
* Ευχαριστώ (efcharistó): This literally means "thank you," but can be used as a polite way of requesting something.
* Θα μπορούσατε (tha borousate): This means "could you," and is used in a polite way to ask someone to do something.
Ultimately, the best word or phrase to use will depend on the situation and your relationship with the person you are speaking to.