1) aer, ar, 含義是空氣，大氣 aeroplane, aerial,
2) ag, act, ig, 含義是做，動作 active, agent, reaction,
3) alt, 含義是高， altitude
4) alter, altern, altr, 含義是其它，變更 alternate,
6) brev, bri, brief, 含義是短 brief, abbreviation, abridge(節略)
7) cap, capt, cept, cip, 含義是取，獲 capture, except, concept, capacity
8) ced, ceed, cess, 含義是行，讓步 proceed, succeed, excess(過度)
9) centr, centr, 含義是中心 concentrate, eccentric(偏心的)
10) clain, clam, 含義是呼喊 claim, proclaim, exclaim
11) clos, clud, 含義是閉合 conclude, enclose, include
12) col, cult, 含義是耕耘 colony, cultivate, agriculture
13) cor, cord, 含義是心 cordial, record, accord
14) curr, cur, cour, 含義是跑，動作 current, occur, concurrence(同時發生)
15) dic, dict, 含義是說，示 dictate, edit, indicate, predict
16) doc, doct, 含義是教 doctor, document.
17) duc, duct含義是引導，傳導 introduce, produce, conduct, deduct( 推論)
18) fact, fac, fect, dic, dit, 含義是做，創造 factory, effect, profit, faculty, perfect
