★-ag-, -ig-, -agit- (frequentative), -act- do, drive, make: agent, agenda, activate, agitate, enact, actual, activism, activity, counteract, exact, exacting, inactive, inaction, interact, react, transact, agency, agile, agility, litigate, navigate

---------------------------------------------------------

agit词根:

Latin agitāre agitāt- [frequentative of] agere [to drive, do]

R: 可以这样理解agit词根是ag, act词根的重复性的词根, 就像st, sta和sist的关系一样