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: Policemen in riot gear, along with two police on horseback are charging a crowd that are behind a barrier. Sentence 2: Policemen are dealing with a crowd outside.

SOLUTION: Policemen in riot gear are raiding a house.

PROBLEM: Sentence 1: A guy is sitting by a tree watching a girl sing with a blue bucket in front of her. Sentence 2: 2 people are by a tree

SOLUTION: two dogs are singing by a tree

PROBLEM: Sentence 1: A little boy wearing a green soccer strip is running on the grass. Sentence 2: A young man wearing a green soccer strip is running around outside.

SOLUTION:
A young girl wearing a blue soccer strip is walking on the grass.