I wish
An exclamation that shows the speaker's belief that something will not happen in the ideal way another person proposes. A: "Do you think you'll get an A in this class?" B: "I wish! I would need to ace my final project and my exam just to have a chance of bringing my average up."
I ˈwish!
(spoken) used to say that something is impossible or very unlikely, although you wish it were possible; if only: ‘You’ll have finished by tomorrow.’ ‘I wish!’