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: three men in brown shorts are walking on rocks beside a river. Sentence 2: Three men are hiking.
Some men walking on rocks.

Sentence 1: A young girl dressed in gray kneels to look at a dog. Sentence 2: She is teaching the dog a trick.
The girl is looking at the dog while wearing gray.

Sentence 1: a man stands next to motorcycles Sentence 2: A man is motorcycle shopping.

A man is near cycles.