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 person walking with a black umbrella walking in front of an iron fence. Sentence 2: Someone with an umbrella passing by a fence.

SOLUTION: A group of tourists with umbrella's peering through the picket fence.

PROBLEM: Sentence 1: Two men skateboarding in the forest. Sentence 2: Two men are outdoors.

SOLUTION: Two girls are in a treehouse.

PROBLEM: Sentence 1: An extreme sports skier grinding on top of a curved structure Sentence 2: The skier is gliding downhill.

SOLUTION:
A boat is pulling the skier towards the jump.