1)A:_____I use the phone? B: Sure. *
1+May
2- Shouldn´t
3-Should

2) A:_____ I borrow the car? B: I´m sorry, I can´t *
1-Might
2-Should
3- Can

3)A: ______ you fix the roof? B: Of course, I will. *
1-Can
2-Will
3-Would​