have been和are being的区别是什么?have been built和are being built还有were building的区别是什么?

问题描述:

have been和are being的区别是什么?
have been built和are being built还有were building的区别是什么?

have been built是表示已经(被)建造完成的,物做主语
are being built表示正在(被)建的,物做主语
were building表示过去某个时间,正在建,人做主语.