TASK DEFINITION: Given a sentence, generate a most likely context or previous statement. The previous statement should be relevant to the given statement.
PROBLEM: Someone turns and runs upstairs.

SOLUTION: He slips two books back into someone's cauldron.

PROBLEM: He looks back and shakes his fist while throwing several more balls.

SOLUTION: A man is seen standing before a bowling lane and throwing a ball down the lane.

PROBLEM: Without standing upright, someone looks up at him from the tree.

SOLUTION:
Someone bends over and sets his manuscript before the closed door.