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 with no shirt and no shoes, who is painting the floor. Sentence 2: A man is working.
A man is painting.

Sentence 1: a man wearing a black jacket stands, holding an open book in front of a chalkboard and globe. Sentence 2: A tall man.
The street vendor was selling bananas.

Sentence 1: Three men in military uniforms and one man in a shirt that says "Canada" are cutting a ribbon. Sentence 2: A group of men are cutting a ribbon for a new military sector.
One person is not wearing a uniform.