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I read some books and watched a video lecture and a movie yesterday. The problem is that I did these things on and off. "I have knew my concentration is bad" but yesterday I felt it keenly. How do I fix it?

I read some books and watched a video lecture and a movie yesterday. The problem is that I did these things on and off. "I knew my concentration was bad" but yesterday I felt it keenly. How do I fix it?

I mean, "I have knew my concentration is bad" vs "I knew my concentration was bad"

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'I knew my concentration was bad' is the correct one. you'd use 'have' if you were using a different tense, like 'I have always known that my concentration was bad'

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