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 skateboarder doing a jump on train tracks. Sentence 2: A boy jumps his skateboard in front of an oncoming train.
A skateboarder jumping.

Sentence 1: A parent and child sitting together. Sentence 2: A mother and daughter are having dinner in the dining room.
Two people are not standing.

Sentence 1: Two men, one in a blue uniform and one in a red uniform, are boxing. Sentence 2: People are fighting.

People are playing sports.