英语动词的变化,in many ways my disability has helped me grow stronger psychologically and become more independent.这里become 为什么用原形,而不用过去式呢?

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英语动词的变化,
in many ways my disability has helped me grow stronger psychologically and become more independent.这里become 为什么用原形,而不用过去式呢?

become-became-become
这是过去分词
has+过去分词,完成时
and连接两个并列主语
helped是过去分词
所以become用过去分词
(become和helped都是谓语,才并列)