TASK DEFINITION: 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.
PROBLEM: Sentence 1: One girl is standing on the street, and the other is crouching looking at something on the ground. Sentence 2: A girl is preoccupied with something on the ground.

SOLUTION: A teacher is talking to her classroom.

PROBLEM: Sentence 1: With flowers in the foreground, a man in a blue striped shirt bikes past a large white building. Sentence 2: A man riding his bike in front of buildings outside.

SOLUTION: A man walks in the countryside, picking up flowers from the side of the road.

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

SOLUTION:
The woman is knitting a scarf.