To ask if someone speaks ASL, you might first want to find out if they are deaf or if they are hearing.
The sign for "deaf" is to use your right hand, with your index finger pointing up, touch it to your temple, and then just below your mouth.
The sign for "hearing" is with your right hand, and your index finger pointing to the left, move it in front of your mouth almost like you are brushing your teeth.
The sign for "sign" is with two hands, using your fingers pointing left and right at each other, spin them around each other like a wheel going backwards.
Remember the sign for "you" is just pointing your finger at someone, and the sign for "I" or "me" is pointing at your chest.
ASL is very different than other languages because you would simply say "you deaf", "you hearing" or "you sign".
It's very important to use your face and body to also show what you are saying.
If you are asking a question, make a face like you are asking a question, or lean forward toward the person.
Also many people who are deaf are very good at reading lips, so you can still move your lips or even speak out loud if you are speaking to a deaf person.
To answer "yes" in ASL, you make a fist with your hand, and move it up and down, almost like a puppet's head nodding.
To answer "no" you put your first and second fingers with your thumb, almost like a puppet's mouth, and open and close them twice.
Here is a helpful video showing these signs:
Sign Language Basics : Sign Language: Deaf or Hearing? Do You Sign? - expertvillage
(from: wikipedia - american sign language)
Italian: Parli italiano?
German: Sprechen Sie Deutsch?
Spanish: ¿Hablas español?
French: parlez-vous français?
