It's possible that #1 could refer to the present - My daughter is getting married at this very moment. I wish I could be there.
It's also just about possible that #2 could refer to the present - My daughter is getting married at this ver moment. I wish I could have been there. (ie: I wish I had been able to get there.)
As we so often say, context will usually make the meaning clear.
Context is important. Please provide enough for us to be able to deal effectively with your question.
Your thread title should include all or part of the word/phrase being discussed.
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