2. eaten
seen
cooked
brought
gone
gotten
3. No, they haven't.
Yes, we have.
Yes, I have.
No, he hasn't.
Yes, they have.
4. Have you looked in your bedroom?
Have you eaten?
Yes, I have just had a snack. How about you? Have you had anything to eat?
I have just seen a new film by Jet Li.
Oh really? I haven't seen any of his films.