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: Brown dog with white marking on forehead coming down cement steps. Sentence 2: A brown dog is coming down with a stick.
A brown dog is coming down.

Sentence 1: Punk rock teenager walks with a mean look on his face. Sentence 2: The angry teenager had a mean look on his face.
The teenager walked with a mean look on his face.

Sentence 1: A group of people in a casual clothing on a lawn stretching in a yoga pose. Sentence 2: People are learning yoga from a teacher outside.

People are stretching outside.