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 woman walking a bike down a busy sidewalk. Sentence 2: A person walking a bike down a busy sidewalk.

SOLUTION: A man walking a bike down a busy sidewalk.

PROBLEM: Sentence 1: People are standing and sitting at round tables in a large room. Sentence 2: People gathered in a room.

SOLUTION: People boarding a bus.

PROBLEM: Sentence 1: Five runners are kneeling at the beginning of a 100-meter race on an indoor track in a stadium full of people. Sentence 2: A few people in a racing competition.

SOLUTION:
A dog is looking sleeping after a long day.