What makes ir irregular in the preterite tense?

This is the exact question, I would like alittle explanation of why ir is an irregular verb in preterite tense so I understand and don't just copy and paste.

Our Spanish tutor is not with us anymore, but see what you can learn from this website.

https://www.spanishdict.com/guide/spanish-preterite-stem-changes

Thank you this helped a lot!

You're welcome! I'm glad it helped. =)

To understand why "ir" is an irregular verb in the preterite tense, we first need to know what the preterite tense is and how regular verbs behave in this tense.

The preterite tense is used to express completed actions in the past. In Spanish, regular verbs in the preterite tense follow specific conjugation patterns based on their verb endings: -ar, -er, and -ir.

Regular -ir verbs in the preterite tense follow a consistent set of conjugation rules. For example, the verb "vivir" (to live) follows the regular -ir verb pattern in the preterite tense:

yo viví (I lived)
tú viviste (you lived)
él/ella vivió (he/she lived)
nosotros vivimos (we lived)
vosotros vivisteis (you all lived)
ellos/ellas vivieron (they lived)

However, the verb "ir" (to go) does not follow the same conjugation pattern as other -ir verbs. Here's how "ir" is conjugated in the preterite tense:

yo fui (I went)
tú fuiste (you went)
él/ella fue (he/she went)
nosotros fuimos (we went)
vosotros fuisteis (you all went)
ellos/ellas fueron (they went)

As we can see, "ir" has an irregular conjugation in the preterite tense. Instead of following the regular -ir verb pattern, it follows the pattern of the verb "ser" (to be). This is because "ir" and "ser" share the same conjugation in the preterite tense.

Knowing this, we can conclude that "ir" is an irregular verb in the preterite tense due to its unique conjugation pattern which differs from the regular -ir verbs.