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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