Air pollution,together with overpopulation,many problems in big cities today为什么用 is causing 而不用 is caused 求详解

问题描述:

Air pollution,together with overpopulation,many problems in big cities today
为什么用 is causing 而不用 is caused 求详解

is caused 是被动用法,is causing是主动用法,空气污染和人口膨胀造成问题是主动形式;另外,此句考察重点是together with的用法,用就远原则,together with overpopulation是插入语,主语是Air pollution,故谓语用单数is而不用are

句意:空气污染和过度人口,如今正在许多大城市引起许多问题
cause 动词,引起,此处不用被动
如果是被动的话,多为 be caused by 由……引起
如:The child's headache may be caused by stress.
那孩子的头痛可能是紧张引起的.
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