1a entails 1b
Becky crashed the car.
The car was crashed.
2a presupposes 2b
The worker managed to close the store early.
The store closed early.
The presupposition trigger word is “managed”. It presupposes that the workers wanted to close early.
3a presupposes 3b
If Kelly went to sleep early, she wouldn’t have missed the bus.
Kelly missed the bus.
The presupposition trigger is “If she went to sleep early”. It presupposes that she went to sleep late.


