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 family, grandparents, parents, and children, are sitting in front of a fireplace and a christmas tree opening presents. Sentence 2: A family, grandparents, parents, and children, are sitting

SOLUTION: A family, grandparents, parents, and children, are not sitting

PROBLEM: Sentence 1: A woman playing a guitar on a makeshift stage, under a tree. Sentence 2: A woman plays guitar.

SOLUTION: A woman walks towards the stage.

PROBLEM: Sentence 1: Three young men are resting on a bench near a food stand while other visitors or shoppers are passing close by. Sentence 2: Three youngsters are relaxing near a food stand.

SOLUTION:
A couple of guys on snowmobiles ride up a mountain.