Preterite: Regular 'IR' Verbs
Spanish: Cambridge International GCSE, topic 8.2.15
Regular IR Verbs in the Preterite Tense
To form the preterite tense for regular IR verbs, remove the IR and add the correct endings for each person (same endings as for regular ER verbs). Here is the example with 'vivir' (to live):

Viví - I lived

Viviste - you lived (singular)

Vivió - he/she lived / you lived (formal)

Vivimos - we lived

Vivisteis - you lived (plural)

Vivieron - they lived / you lived (formal plural)
Test yourself on Preterite: Regular 'IR' Verbs
How do you say 'you lived' (plural) in Spanish?