Consider the following two sentences (from this SO answer):
So the fact that you can now reference pygame.display is an accident of implementation details. You may not be able to in future versions (if the project no longer needs to import pygame.display to load pygame.joystick, for example).
The sentence "You may not be able to in future versions" seems incomplete to me. I think it is missing something and "You may not be able to do it in future versions" will be more complete. So, my question, is the first form without do it correct and complete?