To ask if someone speaks German, you say Sprechen Sie Deutsch?.
It sounds like sh-puh-ehk-en zee doh-ee-ch /?/
To say yes you would say jah which sounds like yah /?/
or to say no you would say nein which sounds like nine /?/
(from: wikipedia - Goethe Institute)
Do you remember how to say it in Spanish?
Hablas espaƱol?