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 man wearing blue jeans, blue shirt and a cap runs in front of a large truck on a street. Sentence 2: A man in blue jeans and a blue shirt is training for a marathan.
A man runs on the street.

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: Two people walking across a street. Sentence 2: the people are women

two people walking