TASK DEFINITION: Given a sentence, generate a most likely context or previous statement. The previous statement should be relevant to the given statement.
PROBLEM: The people demonstrate how to do back and tricks while others watch on their sides.

SOLUTION: A large group of people are seen standing on a mat and performing a routine with one another.

PROBLEM: Someone leap into the air as it crashes back into the air.

SOLUTION: It leaps through the open window.

PROBLEM: He tries to not look at it, then opens it and starts to write.

SOLUTION:
He drops a book on the floor then shuts the door behind him.