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 climbing a mountain. Sentence 2: The man was in a group who climbed the mountain.

SOLUTION: The man climbed the mountain.

PROBLEM: Sentence 1: A man dressed in cowboy attire is riding a horse. Sentence 2: the horse is white

SOLUTION: a man riding a horse

PROBLEM: Sentence 1: skateboarding in public street Sentence 2: People are skateboarding.

SOLUTION:
Skateboarding in the street.