TASK DEFINITION: Given a sentence, generate a most likely context or previous statement. The previous statement should be relevant to the given statement.
PROBLEM: From the church entrance, someone peers through a window, past the monks.

SOLUTION: Someone moves through the crowd, keeping an eye on him.

PROBLEM: He pauses and turns to go.

SOLUTION: She watches as he jogs up the steps on which he was left as a baby.

PROBLEM: A man is surfing in the ocean.

SOLUTION:
Many people are on a beach.