In affirmative dependant sentances, i take it gur and gurb are a synthesis of go (the conjunction) and ro, and gur + ba, respectivly.

Is there any case of gur been from the prepostion 'go' -'to'.


I see no reason that there should, or even could be, but I'd like to clarify where copula form coincide with other words, so I can analyse them correctly.

As far as I know, their origin is completely different. If they look alike nowadays, it's only by chance.

The conjunction "go" derives from "kom" in Pre-Historical Irish (Dennis will correct me if I'm wrong), while the preposition "go" derives from "kos". That's why the mutation isn't the same after them: urú after the conjunction, h- prefixed to vowels after the preposition (it was a gemination in Old Irish).