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I am confused about how to correctly use if with would (+have) or could (+have) while talking about past activities in conditionals.

Please check out these sentences and help me to figure out their differences:

  1. Even if I had tried, I would not have known.
  2. Even if I had tried, I would have not known.
  3. Even if I would have tried, I would not have known.
  4. Even if I would try, I would not have known.
  5. Even if I try, I would not know.
  6. Even if I would try, I had not known.

Are those all grammatical and meaningful? If not, which ones aren’t? What does each one mean and when should I use it?

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