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 child is sliding down a hill on a sled. Sentence 2: The child was outdoors.
A child is sliding up a hill on a sled.

Sentence 1: A surfer in a black wetsuit catching a wave while another one tries to catch up with him. Sentence 2: the surfers are on the water
the woman surfer surfed alone

Sentence 1: Two young girls walk past a stop sign while one balances on a concrete wall. Sentence 2: The girls walked past the stop sign.

The boy rode his bike to the store.