The conjugation pattern for regular verbs in the Pretérito Perfecto Simple tense for -ar verbs is as follows, using the verb andar, to walk: Yo andé - I walked. Tú andaste - You walked. Él/Ella/Usted andó - He/She/You walked. Nosotros/as andamos - We walked. Vosotros/as andasteis - You (all) walked. Ellos/Ellas/Ustedes andaron - They/You walked.