Can someone explain to me what the "formal" tense in spanish is and how to make a word formal. if you have any questions comment it in the ask for information section

Tell what you did last week to around the house. you need to use at least 4 verbs in the preterite tense. they need to be in complete spanish sentences. cf. i washed the dishes, cooked meals for the week, fixed the chairs, and wiped the glass. (this is simply a crossreference or example of what i actually did. these examples would be ideal in your answer.)

Explique por qué la teoría de la tectónica de placas resolvió los problemas con la hipótesis de la deriva continental.

¿dónde está el dormitorio? a. el dormitorio está a la izquierda del baño. b. el dormitorio está junto a la cocina. c. el dormitorio está a la izquierda de la cocina. d. el dormitorio está a la derecha de la sala de estar