exactly(in an exact manner) adverb [UK: ɪɡ.ˈzækt.li] [US: ɪg.ˈzækt.li]Well, when exactly? = Beh, quando esattamente?
precisely(in a precise manner) adverb [UK: prɪ.ˈsaɪ.sli] [US: prə.ˈsaɪ.sli]John knows precisely what he's doing. = John sa esattamente cosa sta facendo.