一词形转换1.develop(v.)—development(n.) 发展2.independent(adj.)—independence(n.)独立性3.fair(adj.)公平—fairness(n.)公平 ---unfair(adj.)不公平   4.ill(adj.)---illness(n.)疾病5.old—elder年长6.communicate(v.)—communication(n.)交流7.usual(adj.)日常—(adv.)usually--unusual(adj.)不日常  8.heavy(adj.)重—heavily(adv.)（雨雪）猛烈地  9.sleep---asleep睡着   wake—awake醒着10.fall(v.)落下—fallen(adj./ 过分)落下—fell(过去式）11.true（adj)—truth(n.) 事实，真相–truthful(adj.同义词：honest) 老实   tell me the truth
12.ice(n.)—icy(adj.)有冰，结冰13.complete(adj.)—completely(adv. ...