have been 的用法

题目

have been 的用法
All the movies that I've done have been very different and all the characters I've done have been very different.
为什么要用have been.
这样写对吗?直接换成 “be”
例如：All the movies that I've done were very different and all the characters I've done were very different

答案

“All the movies that I've done”和“be very different”是同一时间存在的,时态应一致,这是个复合主语从名；
“all the characters I've done”也是这个道理.