"Servir" means to work/ function. "Pedi" means you asked something. Power is the same thing as it would be in English. Prober? Maybe you meant "probar" which means to try something. "Preferir" means to prefer something.
1 Tadeo no es bajo. Es alto. 2 Alberto no es feo. Es lindo. 3 Carlos no es antipático. Es sociable. 4 Felipe no es rubio y no es pelirrojo. Es castaño.
