1. b
Estoy listo porque estoy preparado .
Soy listo porque soy inteligente.
2. c
En la fiesta de sorpresa, la señora cuenta cuantos amigos hay en la fiesta.
Ayer yo prometí llevar a mi sobrino al cine.
This sentence means - Yesterday, I promised to take my cousin to the cinema.
When it comes to the word ayer (= yesterday), you know immediately that you should use the preterite form of a verb, which in this case is prometer. For first person singular, I, that form is prometí.
Because when you are using are and er your sentences changes completely because they sound different
