1. I have never gone rafting.
2. They have just built a fire to warm themselves.
3. I asked my father:"Have you booked the tickets yet?"
4. My sister has had dance classes recently
5. My mother has never played an instrument
6. This engineer has already made a robot which can speak English.
7. We haven't planned our holidays yet
8. Look! Those children have made a tree house in our yard.
