¿qué verbo traduce la frase? we exist

Can somebody me out with this spanish question? completa la oración con la voz pasiva con se. used cars for sale. carros usados. (the answer is not usa los or venta de)

Completa la oración con la voz pasiva con se. the cake was eaten. la torta. (there's no options, just phrase this in the passive tense, do not use google translate)

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