"I wish I can" or "I wish I could"?
What's the difference between "I wish I can do it" and "I wish I could do it"?

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I wish I can do it -  definately 
I wish I could do it - possibly, but not definate

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I cannot think of any way that 'I wish I can' would ever be used; grammatically it is nonesense.  If you 'can' something, then you would not need to wish for it.

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Hello Marc

"I wish I can" is the present tense.
eg : "I wish I can come now"

"I wish I could" is the conditional tense.
eg : " I wish I could come one day." In this case it is a wish or desire  that one day you will come.
Both are correct, it depends what you want to say.

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