1. John has written his homework
2. I have drawn a picture
3. Tom has switched on the light
4. The cat has drunk its milk
5. The the has fallen across the road
6. John has given his bicycle to his brother
7. You have made a mistake
8. We have eaten our dinner
9. The train just has gone
10. I just have told the answer
11. George has never been in Australia
11. John and Richard have just gone away