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 young man carrying a big bag of clothing is standing in an alley and talking on a cellphone. Sentence 2: Young man talking on cellphone
An old man is jogging

Sentence 1: Two children, one wearing purple, the other black, ride a single bike on the pavement. Sentence 2: Two children ride the same bike.
Two adults ride a double seater bike.

Sentence 1: a young boy rides a purple bike. Sentence 2: The boy is riding a bike.

The boy is laying under a tree.