" If I had known I would have told you" 'had known' is the past perfect tense of 'know'. 'would have told' is a modal perfect tense of 'tell'. Some people call this tense with 'would have' a past conditional tense.
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mchiicha wich time is this sentence?" If I had known I would have told you"'had known' is the past perfect tense of 'know'.