2.
A: You look dirty, what have you been doing?
B: I've been repairing my bicycle
A: What have you done?
B: Well, I've already replaced the chain and cleaned the gears, but I haven't checked the tires yet.
3.
A: You look exhausted, what have you been doing?
B: I've been painting my garage
A: What have you done?
B: Well, I've already mixed the paint and whitewashed the walls, but I haven't cleaned the brushes yet.
