Yes, it is the greatest thing in the world. Suddenly, there was a tap at the door, and Cynthia peeped in. 
Cynthia peeped in before knocking on the door.
mnli hypothesis: Cynthia peeped in before knocking on the door. premise: Yes, it is the greatest thing in the world. Suddenly, there was a tap at the door, and Cynthia peeped in. 