请帮我分析一下They have become cold to me.中为什么要加have?
问题描述：
请帮我分析一下They have become cold to me.中为什么要加have?
原句是I find they are not willing to be with me now,and they have become cold to me.
如果是现在完成时，那么为什么become 不用过去式became?
答
现在完成时,have在此处做已经的意思解释
became是过去式 have后面跟的是过去分词 become得过去分词还是它本身