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: Two men on a balcony look up and point at something. Sentence 2: Two men are on a balcony

SOLUTION: One man is on a balcony

PROBLEM: Sentence 1: The black and white dog catches the tennis ball in his mouth. Sentence 2: A dog catches a ball.

SOLUTION: A dog chases a cat to the shouts of its owner.

PROBLEM: Sentence 1: A man in a white shirt and blue jeans is talking on the phone near the street. Sentence 2: A man talks into a cell phone.

SOLUTION:
A man is in a house and is not saying anything.