>>Sure, Bridget, I would agree verb forms show more than just tenses. But "you go" is not a verb form, it's a sentence. "You" is not part of the verb.<<

Yes, Bingley, totally valid.

I think what was going on in my brain was about persons of the verb and 'go' versus 'goes', where the change in form is entirely to do with person and not with tense at all.

Bad example to demonstrate the point we seem to agree on that form covers more ground than tense.

As for conditionals, when I wrote this I was remembering learning the 'conditional tense' in French. Having thought about it, I remember that what I was actually taught was to use the imperfect tense in a conditional sentence. So I suspect you are right about it being a type of sentence. (in English - in Japanese it is a different form of the verb.)

BTW this is a great thread - thanks to everyone who has posted in it.