Why do reflexive verbs have the reflexive pronoun se attached to the infinitive?

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

Which word correctly completes this conversation? valeria: ¿cómo está el clima hoy? carmen: está templado pero está a. calor b. frío c. lloviznando d. templado

Ayer uds. al partido de futbol. (accent on u). a. tuvieron b. visitaron c. escribieron d. asistieron !