In this task, you're given a pair of sentences, sentence 1 and sentence 2, that agree with each other. Your job is to alter sentence 2 so that the pair 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: Four couples, all wearing green are dancing outdoors. Sentence 2: Several couples in green dancing outside.
One couple is swimming.

Sentence 1: A woman smiles with her old-fashioned sewing machine. Sentence 2: The sewing machine is old.
The woman is knitting a scarf.

Sentence 1: The man is playing a stringed instrument on the ground. Sentence 2: The man is making music with an instrument.

A man is standing and playing a tuba.