Question

I have known him since last three years. i have known him for last three years which of the two is correct

Answer 1

I have known him for last three years is correct dear. Because we use "for" for a long period of time or in which we specify the times.

Hope it helps..

Answer 2

Heya...!!!

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QUESTION
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I have known him since last three years.

I have known him for last three years
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ANSWER
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The correct sentence is ;- I have known him for last three years

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Hope it helps