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: a troubled man standing beside many hanging products Sentence 2: The man is depressed.
The man is standing by hanging products.

Sentence 1: A toddler is sitting on a wooden horse and smiling. Sentence 2: A little girl is riding on her wooden horse.
A child is playing on their toy.

Sentence 1: A man, wearing black jeans and a gray shirt, stands in the front of a classroom writing on a chalkboard. Sentence 2: A man is teaching.

A man is writing on a chalkboard.