@snailboat Is
dive – dived / dove (AmE) – dived a "regular verb"? Or perhaps "slightly irregular"? I'd understand if for analysis' sake you'd adopt a more scalar-like system, but I'm not really sure how to answer
this. "The question is, do all regular verbs have the same form for V2 and V3?" Yes, but don't they definitionally? Their question would be okay if they didn't know what
regular meant, I think.