TASK DEFINITION: In this task, you're given a pair of sentences, sentence 1 and sentence 2, that neither agree with nor contradict each other. Your job is to alter sentence 2 so that the pair clearly 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 man with a scruffy beard passes out fliers near a few bikes chained to a gate. Sentence 2: A guy with a beard is passing out political flyers.

SOLUTION: A bearded man is handing out flyers.

PROBLEM: Sentence 1: A man wearing blue jeans, blue shirt and a cap runs in front of a large truck on a street. Sentence 2: A man in blue jeans and a blue shirt is training for a marathan.

SOLUTION: A man runs on the street.

PROBLEM: Sentence 1: A man and a boy are outside playing with a dog in the evening. Sentence 2: Tall humans playing

SOLUTION:
Humans playing