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: A man in a black shirt and gray hat gives the thumbs up to a crowd with one hand, while holding a microphone in the other. Sentence 2: a man gives a thumbs up

SOLUTION: a loan man on a horse

PROBLEM: Sentence 1: There is a shirtless toned white man standing on a balcony of a construction site and holding some sort of tool. Sentence 2: A shirtless man is working construction.

SOLUTION: The shirtless toned man is black.

PROBLEM: Sentence 1: Two men work on a metal roof in the sunlight, one man is wearing a white shirt and the other man is wearing a black shirt and holding a drill. Sentence 2: Two men are working on a roof.

SOLUTION:
Two women are working on a roof.