there ...great changes in my hometown in the last ten years

问题描述:

there ...great changes in my hometown in the last ten years
为什么用have been

There have been great changes in my hometown in the last ten years.
解析:in the last ten years 为表示一段时间的时间状语
所以句子要用 现在完成时为什么不用has beenchanges 为 可数名词复数形式 谓语动词 要与之保持一致