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.

Sentence 1: People walking across a crosswalk. Sentence 2: People are crossing the street.
People are walking on the sidewalk

Sentence 1: Two children wearing a uniform of pink shirts and blue pants are standing in a grassy field at an event. Sentence 2: Two children are friends
Two children are standing at an event

Sentence 1: Three skateboarders with helmets look like they are going very fast. Sentence 2: Three skateboarders are being safe.

The skateboarders are going down a hill.