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: A group of people gathered at a school. Sentence 2: The school doors are about to open.
People gather at the school.

Sentence 1: A biker in uniform suspended in air in front of a crowd of people. Sentence 2: A biker is wearing a police uniform.
A human is suspended in air.

Sentence 1: A man and a woman wearing helmets and sunglasses are sitting outside in a park. Sentence 2: A man and woman sitting in the park.

There are people in the park.