The Preterit Tense of Reflexive Verbs

Reflexive verbs always use reflexive pronouns in the preterit, as shown below. They always appear immediately before the conjugated verb, as they do in the present tense and all other tenses.

Lavarse

means to wash oneself. It is a reflexive verb, since you do it to yourself, it it is lavar, means to wash somebody and therefore, not anymore a reflexive verb.

The reflexive always need from a pronoun.

I order to remember see THIS CHAPTER of Spanish pronouns

Pronoun Verb conjugated Stem Ending
(Yo) melavélavé
(Tu) telavaste lavaste
(el/ella) selavó lavó
(usted) se lavó lavó
(ustedes) se lavaronlavaron
(nosotros) nos lavamoslavamos
(ellos/ellas) se lavaron lavaron


GRAMMAR NOTE

Hace (from the verb hacer / to do, to make may be used with the preterit tense to mean ago, like  the following examples.

Construí la casa hace dos años. / I built the house two years ago.

Estudié esa lección hace dos semanas. / I studied that lesson two weeks ago.

TIP

Certain adverbial expressions of time are often used with the preterit tense. The following is a list of some of the more common ones.

anoche / last night

ayer / yesterday

anteayer / day before yesterday