-bas-

basement,base,below

-Cap,capt-

capture,capable,credibility

-cred-

credit,credible

-dict-

predict,dictionary,dictator

-duc,duct-

induce,conduct,ductape

-fac,fact-

artifact,facmsimile,factor

-graph-

aurograph,grapich,graphicorganizer

-log-

dialog,biology,geology

-mort-

mortal,morticion,immortal

-scrib,script-

transcribe,subscription,scrible

-spec,spect-

specimen,aspect,spectate

-tact-

contact,tactile,tactic

-ten-

tenacious,retentive,tentive

-therm-

thermostat,thermometer,thermo

-ver-

very,verify