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 does a stunt in the city. Sentence 2: A skateboarder does a trick for the crowd.
A person is skateboarding in the city.

Sentence 1: Several people walk through a crowded Asian city. Sentence 2: A tourist group is touring the city with their tour guide.
There are several people in this photo, and they are all outside.

Sentence 1: Two men holding their boat on the beach. Sentence 2: The boat on the beach is being held by two men.

Two men on the beach are holding the boat.