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.

Sentence 1: A guy wearing a black shirt and a red hat riding his skateboard. Sentence 2: A guy is riding a skateboard.
A guy is riding a scooter.

Sentence 1: Many dogs are running the same way in a field. Sentence 2: Many dogs are running together
Cats are chasing birds

Sentence 1: A boy wearing red shoes is climbing in a tree. Sentence 2: A boy climbs a tree.

A man climbs a ladder