Hi, Ivan:<br /><br />It's a difficult call. Grammatically, it should, of course, be an adverb 'positively or negatively,' but in conversation people would probably say, 'either positive or negative' -- unless he or she was an English teacher&nbsp;<br /><br />How about "... can affect you in different ways, positive or negative"?<br /><br />If you really want to use the adverbial form, I would go with "... can affect you either positively or negatively." It comes down to a difference between written and spoken English. "Real good' versus "Really good."<br /><br />I've attached the file.&nbsp;<br /><br />George