Task 2.
2. Suzy has already gone to the dentist.
3. Billy has already met Ted.
4. Clare hasn't picked up Lucy yet.
5. Mum has taken Lewis to the park before.
6. Penny hasn't bought a present for Judy yet.
7. Gary has already seen Fin.
8. William has gone to the zoo before.
Task 7.
2. We haven't celebrated Tom's birthday yet.
3. Carrie has just finished her homework.
4. I've never met an explorer before.
5. Has Jason taken the bottles to the bottle bank yet?
6. They've just broken the window with their ball.
7. Have Tommy and his dad been caving before?
8. Everyone has already eaten the cake.