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: Man riding a surfboard on a wave. Sentence 2: There is a person in the water
The surfer is sunbathing on the beach

Sentence 1: Individuals are building a house. Sentence 2: People are building a house.
A construction crew is demolishing a house.

Sentence 1: 1 man standing and several people sitting down waiting on a subway train. Sentence 2: People waiting.

A group of dogs chase a cat.