Answered By: Writing Center
Last Updated: Apr 28, 2015     Views: 0

If I knew is used to tell an imaginary situation, which is usually opposite to the real situation. 

e.g.: If I knew his number, I would phone him. 

Wish I knew is used to say that we regret something or something is not as we would like it to be.

e.g.: I wish I knew his phone number. 

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