When I lived in Spain I was always getting it in the neck from my wife's Spanish teacher as I was always using the pretorite when he always insisted that the imperfect was the correct way in 'proper' Spanish.
I say this as I learned Spanish in BA as a teen, so I would say 'Fuiste al super?' or 'Che, tuviste mala suerte, no?'
So he would then say 'That's wrong, you should say:Has ido al supermercado? o 'Hombre, has tenido mala suerte, no?'
I'm open to corrections of course, but it did encourage me to wind him up a tad as he used to get almost apoplectic.
