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: Two women in skirts walking across a street. Sentence 2: They were walking.
Both women wore pants.

Sentence 1: A man in a gray shirt playing a whistle. Sentence 2: A man is playing a whistle.

two men sit quietly