Did you clean your teeth two days ago? Yes, I did
Did you Help your mother two days ago? No, I did not
Did you walk your dog two days ago? Yes, I did
Did you clean your room two days ago? Yes, I did.
Mark did not go shopping two days ago, but he walked his dog. Mark did not feed his cat, but he helped his mother. Mark did not walk with his friends, but he did his homework