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 small child pushes a stroller down the street. Sentence 2: A small child holds onto a stroller.

SOLUTION: A small child tips over a stroller.

PROBLEM: Sentence 1: A man in a blue jacket smiles back at the camera, positioned in front of a lake or large river on a clear sunny day. Sentence 2: A man is posing for a picture outside.

SOLUTION: A man is snowboarding down a huge mountain.

PROBLEM: Sentence 1: A dog jumps for several tennis balls thrown at him. Sentence 2: The dog is jumping

SOLUTION:
The dog is sitting