Present Perfect/Present Perfect Continuous.
1. have walked.
3. have walked.
4. have been making.
6. has eaten.
8. has been drinking.
9. have pulled.
10. have been pulling.
11. have you been doing; have been picking.
13. have slept.
15. has been riding.
16. have ridden.
17. has made.
20. have been hearing.
21. have greased.
22. have been polishing.
26. have been; have been pumping.
27. have pumped.
28. have looked; haven't found.
29. has been coughing.
31. have been trying; have said.
35. have been whispering; have you been helping; has he been helping.
36. have you been making; have lost; have been trying; have been throwing.
