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.
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Question: Sentence 1: Dog training on the mountain Sentence 2: A dog is taking a class.

Answer: A dog is on a mountain.


Question: Sentence 1: A young man with no shirt on is wearing black pants and sneakers is jumping over a blue skateboard. Sentence 2: This young man is attempting the most difficult skateboarding trick known to man.

Answer: a man in black pants jumps over his skateboard


Question: Sentence 1: A canal with a boat sitting in it and people walking and sitting on the sidewalk Sentence 2: The boat is in a city.

Answer:
The boat is on water.