In Prefixes^x, Negatives^x, Adverbs^x

Miles -- I don't mean to be too discouraging, but "performaly" is not a word. I'm not even sure what an adjective form of a verb would be, unless you mean somehing like "a performing bear," in which case you would use the gerund. Not all parts of speech can be turned into other parts of speech...

Hi! I'd like to ask anybody. How can I easely learn prefixes an suffixes. Is there a dictionary what can easely help me? For instance, I can have the verb perform. Noun is performance, person is performer, adjective is performaly, and negative adjective, adverb and negative adverb. My dream...

There is no rule. Words with these prefixes have come about through accidents of history. The most usual is "un-", but always consult a dictionary. The following does not really answer your question, but you may find it somewhat useful anyway, especially if you're willing to work to dig some...