A: Could you give my eye to the poor girl?
B: But then you wouldn't be able to see.
(What is the meaning of B? #1, #2 or #3?)
1. If I could give your eye to the poor girl, you wouldn't be able to see.
2. If I gave your eye to the poor girl, you wouldn't be able to see.
3. If I give your eye to the poor girl, you wouldn't be able to see.
B means you would have no vision.
All are correctly phrased.