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: One girl is standing on the street, and the other is crouching looking at something on the ground. Sentence 2: A girl is preoccupied with something on the ground.
A teacher is talking to her classroom.

Sentence 1: Many people are sitting in yellow folding chairs. Sentence 2: The people are sitting in chars.
Everyone is standing on a cliff.

Sentence 1: guy wearing a hat skating with skateboard Sentence 2: The man is moving

The man is walking