1)
1.Can you swim? Yes, I can.
2.I'm sorry, I can't help you today, I'm really busy.
3.Please can you buy some milk on your way home? I can't leave the house because I'm looking after the baby.
2)
1.I have a bike. And I can ride a bike but I can't drive a car.
2.Look!It's right there! Can you see it? It's so obvious!
3.Hello, can I help you'? 'Actually, no, you can't.This restaurant is awful and we've been waiting here for half an hour. We're leaving'.
3)
1. I have a special talent, I can touch my nose with my tongue, can you?
2.Can I go to the bathroom please'? 'Yes, of course you can.
3.. I just can't manage to wake up on time, I'm always late.