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.

3 answers

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. =)