Your sentence, "Everything you tell me, I already knew" is using two different verb tenses. "Tell" is the present tense - someone is telling you something right now. He or she is speaking at this instant. "Knew" is past tense - you already had the knowledge that the person was telling...
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Your sentence, "Everything you tell me, I already knew" is using two different verb tenses. "Tell" is the present tense - someone is telling you something right now. He or she is speaking at this instant. "Knew" is past tense - you already had the knowledge that the person was telling you.
The sentence could be correctly written in either of two ways. You could use the past tense for both verbs - "Everything you told me, I already knew" or use the present tense for both - "Everything you tell me, I already know". In either of those statements, the verb tense in both parts of the sentence is in agreement.