10 verbs which change their spellings completely when we put them in past tense?

be was been - the most irregular verb in the English language.
(I am, you are, he/she/it is ...)

eat ate (An anagram, same letters but totally different distribution)

you mentioned: go went

There are some verbs, where I would count the past simple and/or the past perfect as 'sufficiently' different, like:

wear wore worn, etc.

But look for yourself:

www.usingenglish.com/reference/irregular-verbs/