probably(in all likelihood) adverb [UK: ˈprɒ.bə.bli] [US: ˈprɑː.bə.bli]John is probably over thirty. = Johnás seguramente tiene unos treinta años.
safely(in a safe manner) adverb [UK: ˈseɪ.fli] [US: ˈseɪ.fli]I felt relieved when my plane landed safely. = Me sentía aliviado cuando mi avión aterrizó seguramente.
surely(certainly, undoubtedly) adverb [UK: ˈʃʊə.li] [US: ˈʃʊr.li]Surely he left already. = Seguramente ya se marchó.