TASK DEFINITION: Given a sentence, generate a most likely context or previous statement. The previous statement should be relevant to the given statement.
PROBLEM: He tosses the little boy into the water.

SOLUTION: Someone, he carries a boy.

PROBLEM: Someone helplessly watches him go, unlocking the cage.

SOLUTION: Bowing his head, someone shuffles back a few steps, then heads inside.

PROBLEM: Someone pushes his way past them.

SOLUTION:
Someone plunges into the tunnel behind the others.