Preterite: Irregular 'ER' Verbs: 'Ser'
Spanish: Cambridge International GCSE, topic 8.2.9
'Ser' in the Preterite Tense
'Ser' is completely irregular in the preterite tense.

Fui - I was

Fuiste - you were

Fue - he/she was / you were (formal)

Fuimos - we were

Fuisteis - you were (plural)

Fueron - they were / you were (formal plural)
Test yourself on Preterite: Irregular 'ER' Verbs: 'Ser'
¿Qué significa 'fui' en inglés?
How do you say 'you were' in Spanish?