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18.Human population growth will be probably the most serious problem if itisn't controlled (not control) properly.

分析 人口的增长如果不适当的控制,就可能是最严重的问题.

解答 答案:isn't controlled.if引导的条件状语从句,遵循主将从现的规则,故从句用一般现在时,结合not control用否定式,主语it替代Human population 是动词control"控制"的承受者,构成被动关系,故用一般现在时的被动语态am/is/are+过去分词,主语it三单,故is,加上not缩写成isn't,control的过去分词是controlled,故答案是isn't controlled.

点评 一般现在时的被动语态am/is/are+过去分词的呈现,各种类型的被动语态的构成要理解掌握.

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