Answer:
In Spanish, the infinitive form of a verb is usually recognizable by its ending in -ar, -er, or -ir. To form the preterite tense, the infinitive is usually conjugated by dropping the -ar, -er, or -ir ending and replacing it with the appropriate preterite endings. However, there are a group of verbs called "irregular verbs" that do not follow this pattern and have their own unique preterite conjugations. These irregular verbs in the preterite include verbs like ser, ir, dar, ver, and saber, among others. To determine when to use an IR verb in the preterite, you need to recognize the verb as an irregular verb and know its unique conjugation in the preterite tense.
Step-by-step explanation: