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: Dog training on the mountain Sentence 2: A dog is taking a class.
A dog is on a mountain.

Sentence 1: Two people posing for a picture. Sentence 2: Two people are getting glamour shots.
Two people are posing.

Sentence 1: A young woman builds a gingerbread house. Sentence 2: a young girl is building a gingerbread house for christmas

a girl is creating an edible house