He acted as if he knew me well.


1) He acts as if he knows me well.


2) He acts as if he knew me well.


3) He acted as if he knew me well.


4) He acted as if  he had known me well.


I know there is a meaning difference between #1 and #2, but I was wondering if we should see #3 as a tense agreed sentence and a past version of  #1 or Conditional 2 like #2? If my question is unclear, I just would you like to let me know the meaning of the #3 and what is a difference between #2 and #3 then?


Thank you so much as always and have a good day.

edited Oct 23 '13 at 11:47 Hans Contributor

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