Originally Posted By: Zed
I would still call it incorrect. On/upon sounds correct though. (did I win anything??)

But why exactly is it incorrect? And how come it is correct when you add on/upon? Doesn't it have the exact same meaning as before? When I read the two alternatives aloud to myself, they had the same meaning to me. Is it just me? I should point out that I am not a naitive speaker of English.

Thanks for responding to my message, BTW! :-)