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 man long boarding down an empty street. Sentence 2: A skateboarder skating down a street.
A man bicycles down a street.

Sentence 1: A skier splits his or her legs while flying throught the air over a ski hill. Sentence 2: A skier splits his or her legs while flying through the air.
A skier is on the ground.

Sentence 1: One adult and three children outside playing and having a good time. Sentence 2: An adult and some childern are outside.

An adult and some children are inside.