TASK DEFINITION: Given a sentence, generate a most likely context or previous statement. The previous statement should be relevant to the given statement.
PROBLEM: Later, his board rests on a chair outside as he comes in.

SOLUTION: At an isolated nighttime beach, someone crouches over his surfboard and waxes it aggressively.

PROBLEM: They run around obstacles and have a great time.

SOLUTION: A helicopter flies in some people who then start playing paintball.

PROBLEM: Snow falls gently on the spires and roofs of hogwarts.

SOLUTION:
He leans on the balustrade and looks out over the school.