How do you say "What do you serve at your restaurant?"
How do you say what do you serve at your restaurant. but to serve needs to be in the usted form. so wouldn't be servió.
Isn't this 'formal'? ¿Qué sirve usted en su restaurante?
I am not at all clear as to what you are asking. Your original question "what do you serve at your restaurant" is not in the past tense. What do you mean by "skateboard" verb?
If you are asking a specific person who is a formal you, then you would say "Qué sirve Ud. [sirvió ud.] en este restaurante? However, perhaps you mean a general "you", as in "what is served in this restaurant" In that case you would use the 'passive se': "Qué se sirve [se sirvió - was served] [se servía - used to be served] en este restaurante?" ... Probably the "skateboard verb" is a term someone is using to indicate stem changing verbs in the preterite.
¿Qué servía en su restaurante?
Usted is always just third person singular - so it will be "servió" - What did you serve (sir)?
but when your using the usted form in the preterite its a skateboard verb. uhh i dont get this.