Can or could

[margo16]

I could finish the project tomorrow.
I can finish the project tomorrow.

Both sentences are grammatically correct but 'could' expresses a greater degree of doubt, right?

 

[tepatria]

You are right. Can states the ability to, could states the ability but nor necessarily the willingness.

 

[CarolSueC]

Correct. Also, "I could finish" implies "if I want to do so." "I can" indicates it is possible and I intend to finish.