一道语法题 in the first three months that giant pandas一道语法题in the first three months that giant pandas were on public display,visits to the zoo ( )by as much as 50 percent为什么是 increased而不是have increased
问题描述：
一道语法题 in the first three months that giant pandas
一道语法题
in the first three months that giant pandas were on public display,visits to the zoo ( )by as much as 50 percent
为什么是 increased而不是have increased
答
一个句子不能出现两个谓语动词，但可以出现两个或以上的动词，谓语动词就是带有语法、时态、语态的动词 （要变形、要有助动词）
前面已经有：were on public 谓语是were(be动词）
后面无法再用一个：have increased了（have是助动词，构成完成时，因此算谓语动词）
要用动词的话，只能用动词的非谓语形式，有动词不定式，分词，这里用了过去分词，其实就是have increased的助动词省略，也可以理解为过去分词表示一种状态，“上升、增加的趋势”
答
你好.很简单.1 in the first three months --------强调过去某一年的第一季度,当然用一般过去时.比如说：in the first three months of 2011,能不用一般过去时吗?必须是一般过去时.2 in the past / last three mont...