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: A football player kicks the ball. Sentence 2: A member of a sports team playing a game.

SOLUTION: A baseball player on the bench.

PROBLEM: Sentence 1: These two young boys with blue and gray shorts, smile for the camera before they go play outside. Sentence 2: young boys are smiling.

SOLUTION:
The boys are old.