题目内容
14．Bill's courage is sure toenable himself to make greater progress in the future．（able）分析 比尔的勇气肯定会使自己在将来获得更大的进步．
解答 答案：enable．be sure+不定式，表示说话人对句子主语作出的判断，认为句子主语"必定"、"必然会"、"准会"如何如何．故后加动词原形，able是形容词有能力的，加上前缀en构成enable动词，表示使能够，故答案是enable．
点评 en作为前缀，加在某些形容词前构成动词．表示"使（成）…"．例如：able→enable（使能够），large→enlarge（扩大），rich→enrich（使富有，丰富）
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