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 gives her husband a tight smile.

SOLUTION: He places someone's bag over her shoulder and opens the door to let her out.

PROBLEM: He chalks lines through four more.

SOLUTION: He's chalked architectural firms names on his wall.

PROBLEM: She approaches someone and who stands.

SOLUTION:
He removes his cap and glances up at someone as he strides towards the main building.