9. To-: to study
Present: study
Past: studied
For an action in progress: studying
10. To-: to ask
Present: ask
Past: asked
For an action in progress: asking
11. To-: to make
Present: make
Past: made
For an action in progress: making
12. To-: to do
Present: do
Past: did
For an action in progress: doing
13. To-: to come
Present: come
Past: came
For an action in progress: coming
14. To-: to help
Present: help
Past: helped
For an action in progress: helping
15. To-: to fix
Present: fix
Past: fixed
For an action in progress: fixing
16. To-: to call
Present: call
Past: called
For an action in progress: calling
17. To-: to mix
Present: mix
Past: mixed
For an action in progress: mixing