A native speaker told me that “nice meeting you” is used only after meeting a person [color=red]who we were not introduced before with. And once we are introduced, we say, “Nice seeing you”. Do you agree?
Tom
PS: Is the red line correct and natural? How about, with whom we were not introduce before.
Are you trying to tell Tom that the most commonly used wording of his sentence would be with “whom”? (That sort of advice would sound rather prescriptive to me.)
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What has “commonly” got to do with “very formal”? I’m wondering why you said that whom is very formal and did not just say “whom is formal”, which is truer.