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: A person wearing a hat and baggy pants is skateboarding on cement. Sentence 2: A human rides a skateboard.
An old man falls off a skateboard.

Sentence 1: A group of kids are posing outside for nice picture. Sentence 2: Some kids are getting ready to take a picture outdoors.
Mothers lining up for a photo.

Sentence 1: Archaeologists digging out a site. Sentence 2: The archeologist are digging

They are sitting on the couch