2) is the only correct answer. You are only talking about one person - Peter - so you use the singular form 'has'. If it were more than one person you would use 'have' - for example: Peter and June have been very kind to me.
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Pradeep_tpHello,
Can anyone helping in finding out, which of the folloing two sentences are grammatically correct.
1) I know Peter who have been very kind to me
2) I know Peter who has been very kind to me.
In internet and many magazines, I have seen both the phrases being used. Can anyone please tell me the difference.