Ser is a Spanish verb meaning to be. Ser is conjugated as an irregular verb in the preterite tense. Ser appears on the 100 Most Used Spanish Preterite Tense Verbs Poster as the #1 most used irregular verb.
For the present tense conjugation, go to Ser Conjugation - Present Tense.
Ser Conjugation: Preterite Tense
*Irregular forms in bold.
The participio of Ser is sido. The present perfect tense is formed by combining the auxiliary verb haber with the participio.
Ser Imperfect Root
The imperfect root of Ser is era. The imperfect tense is rarely irregular and can be easily conjugated from this form, which is the yo, and él/ella conjugation.
Regular vs. Irregular Verbs
A verb is called a regular verb when its conjugation follows a typical pattern. A verb which does not follow these patterns exactly is called an irregular verb. In Spanish Preterite Tense, the 3 regular patterns are for verbs ending in ar, er, and ir.
Spanish Preterite Tense Conjugation Chart
Looking for more verbs like Ser? Check out our Spanish Preterite Tense Conjugation Chart, the 100 Most Used Spanish Preterite Tense Verbs Poster!