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请帮我分析一下Theyhavebecomecoldtome.中为什么要加have?原句是Ifindtheyarenotwillingtobewithmenow,andtheyhavebecomecoldtome.如果是现在完成时,那么为什么become不用过去式became?

题目详情
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?
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答案和解析
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