Answer:
what? what are you asking
Answer:
If John’s great-grandfather was killed as a child, John would not have been born. John would not have been able to travel back in time to take his great-grandfather to the circus. So his grandfather would not have been killed. If his grandfather had not been killed, John would have been born and could travel through time.
Example, is your answer because an example is a type of real-life or imaginary scenerio
Answer:
makes
Explanation:
because its the only that would make sense in present tense.