Present: help
Past: helped
For an action in progress: helping
15. to fix
Present: help
Past: helped
For an action in progress: helping
16. to call
Present: call
Past: called
For an action in progress: calling
17. to mix
Present: mix
Past: mixed
For an action in progress: mixing
18. to tell
Present: tell
Past: told
For an action in progress: telling
19. to look