you would use "es" to describe someone being silly in that sentence.
Brainliest please and thank you.
Estuviste because estuviste is past tense for tú
Ana, eres estudiante ? si, Juan, yo soy una estudiante de Argentina
sorry for the ? at the begining and the accent....i can't with my PC....
ser
soy
eres
es
somos
sois
son
hope I helped !