TASK DEFINITION: In this task, you're given a pair of sentences, sentence 1 and sentence 2, that agree with each other. Your job is to alter sentence 2 so that the pair 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: Person riding wave on stomach on a blue surfboard. Sentence 2: A person on a wave.

SOLUTION: Nobody on a wave.

PROBLEM: Sentence 1: A woman helps a child with playground equipment. Sentence 2: A woman helps a child.

SOLUTION: A horse eats an apple.

PROBLEM: Sentence 1: An artist is painting a mural on the side of a building. Sentence 2: An artist is working outside.

SOLUTION:
The artist is working in his studio.