A) Skating, eating, watching TV, cooking, ... sleeping
б) I have already to swim in the pool
I have already to go to the shop
I have already to see a new film
I haven't done to buy a new pen
I haven't done to think about a birthday present
I haven't done to draw a picture
I haven't done to take pictures
I haven't done to give foot to your pet
I have already to drink milk