Prefix Skills This game is here to help you in learning your prefixes. Tools A B auto- self pre- before uni- one mid- middle trans- across re- again hyper-, super exceeding multi-, poly- many co-, con-, com- with inter- between post- after vita- life tri- three dis-, un- opposite bi- two aqua-, hydra- water geo- earth ir-, il-, im-, in- un-, not sub- below anti- against