TASK DEFINITION: In this task, you're given a pair of sentences, sentence 1 and sentence 2, that neither agree with nor contradict each other. Your job is to alter sentence 2 so that the pair clearly contradict each other. Generated sentences must be short, with less than 15 words. New information can be introduced. Avoid using pronouns to confuse the subject of the sentence.
PROBLEM: Sentence 1: A man on a steep incline wearing a white shirt is working on a roof, with lots of debris all around. Sentence 2: A man is cleaning all the trash off a roof.

SOLUTION: The man is doing work.

PROBLEM: Sentence 1: A house is being demolished. Sentence 2: A wrecking ball is destroying a house.

SOLUTION: A house is being destroyed.

PROBLEM: Sentence 1: One musician is standing on a musical drum which has been lifted in the air by a few people at the concert and another musician is playing another musical instrument. Sentence 2: A crowd of people hold a drummer aloft on top of a drum while a guitar player plays.

SOLUTION:
Some people are holding a drum in the air with a person on it and a musician is nearby playing and instrument.