<span>the question like this is called assumptions, but the assumptions have to be proved by experiments and prove to be the best, but generally in science, theories might change from time to time, so in science, it is necessary to prove the hypothesis, not just by putting up the theories.
hope this helps </span>
It's b) Vas a comprar un vestido
Verb: cantar
Yo canto - Cantaba
Tu cantas - cantabas
Èl/Ella/Usted canta - Cantaba
Nosotros cantamos - cantabamos
Ellos/Ellas/Ustedes cantan - cantaban
Putia is not a real word, have you spelt it correctly? respond/comment the correct word and spelling.
thanks