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 guy in a white shirt skateboarding on a ramp. Sentence 2: There is a man doing a trick in the air.
A skateboarder rolls along.

Sentence 1: People sit on benches in front of a large building. Sentence 2: A crowd of people sat on the benches in front of the small building.
A crowd of people sat on the benches.

Sentence 1: a group of people are canoeing down a river through a rainforest. Sentence 2: People are canoing in the rapids.

People are canoeing.