If the egg pancakes had not been cooked earlier, if the municipal government had not chosen to build roads at this time, if Yan Ming could accompany Nan Wang to buy a new car last Friday, if the construction truck driver did not drive tiredly, if Nan Wang had not left Yan Ming alone... If any of these became a reality, then Nan Wang would not have been in a car accident.
Unfortunately, "if" can only be "if".
The egg pancakes flipped by Aunt Liu were like butterflies flapping their wings, creating a storm. Nan Wang and Yan Ming were involved in the repeated "yesterday".