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 group of people gathered at a school. Sentence 2: The school doors are about to open.
People gather at the school.

Sentence 1: A crowd surrounds a grounded hot air balloon. Sentence 2: Crowd watching someone fly away
Crowd gathering

Sentence 1: A woman with a black jacket sitting down while playing a piano. Sentence 2: The woman is a piano teacher.

The woman is playing the piano.