题目内容
19．不断增长的人口已经成为当今时代最大的挑战之一．Theincreasing population hasbeen one of the greatchallenges in the world now．
分析 increasing，been，challenges．
解答 答案：increasing，been，challenges．这里的主语是说不断增长的人口，处于增长中用现在分词increasing做形容词，修饰population，这里是说已经成为用现在完成时have/has+过去分词，成为be，过去分词是been，后面的one of…表示…中之一，后面加上名词的复数，挑战challenge，加s构成复数，故答案是increasing，been，challenges．
点评 现在分词与过去分词的两大差别 1．在语态上：现在分词表主动，过去分词表被动． A tiring journey 累人的旅行A tired football player 累了的足球运动员
2．在时态上：现在分词表进行，过去分词表完成．boiling water 正在开的水boiled water 已经煮开过的水（可能是凉开水）
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