semi: half semifinal, semiconscious, semiannual, semimonthly, semicircle

sub: under, below submerge, submarine, substandard, subnormal, subvert, subdivision, submersible, submit

super, supra: above superior, suprarenal, superscript, supernatural, supercede, superficial, superhero, superimpose

syn: together synthesis, synchronous, syndicate, synergy, snyopsis, syncretism

tele: distance, from afar television, telephone, telegraph, telemetry, telepathy, teleconference

trans: across transoceanic, transport

un: not uncooked, unharmed, unintended, unhappy, unenlightened, unremarkable