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: A string quartet practices for an up-coming performance. Sentence 2: A string quartet practicing.
The woodwind section warming up for a performance.

Sentence 1: Hispanic woman hanging out her window with small boy. Sentence 2: A woman holds her small boy in a window.
An old man sits in a windowsill with is cat.

Sentence 1: A child is hitting a soccer ball with their chest. Sentence 2: A child playing a soccer.

A child tosses a ball.