Ex 3:
2. The boys haven't eaten their breakfast.
3. I haven't bought a new bag.
4. Eric hasn't brushed his hair yet.
5. Lisa hasn't sent an email to her cousin.
6. I haven't seen...
7. The dog has been ....
Ex 2:
2. Have
3. Have
4. Has
5. Have
6. She's
7. We've
8. I've
9. She's
10. They've