Casa es un nombre comun o propio

Translate the sentence below into english.    pienso que nunca lo sabré. a. she doesn't believe he will ever find out. b. i believe that i'd never find out. c. she thinks that i'll never find out. d. i think that i'll never find out.

Complete the sentence with the correct form of the verb caerse in the preterite tense. yo caminando en el parque. use the following jumbled words to write a sentence, using the preterite form of verbs with the same conjugation as caerse. el gato / oir / ellos use the following jumbled words to write a sentence, using the preterite form of verbs with the same conjugation as caerse. oir / maria / no / el anuncio

I'm stuck between soy, or estoy.which one is it?