They both have the sense of coveying information, but they have a distinction in these two examples:
跟你谈一谈 (have a talk with you)
跟 conveys a sense of conversation with someone.
无言以对 (have nothing to say in reply)
对 conveys a sense of response to someone.
19 de junio de 2020
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when they are followed by someone, 跟 implies "mutual", 对 means "treat", they both have many other meanings.