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 young thin man with a backpack wearing striped t-shirt and glasses is walking on the street and looking at something on his right. Sentence 2: A young black man with a backpack walks down the street at night.
A young man with a backpack walks down the street.

Sentence 1: A busy plaza with several people having conversations. Sentence 2: A plaza has a lot of people shopping.
A plaza is full of people talking.

Sentence 1: A little girl is walking her bike a lawn. Sentence 2: A girl is pushing her bike because the tire is flat.

A girl is walking.