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 crosscountry biker with helmet and sports gears (green and black) is jumping in the air with his bike that has dirty tires. Sentence 2: A biker performs a stunt.
Two people talk in private.

Sentence 1: A young girl is sleeping on the sofa, amidst a bunch of pillows. Sentence 2: A girl is asleep.
A young girl talks on the phone.

Sentence 1: A brightly-colored skier flies through the air with his skis slightly crossed. Sentence 2: A skier practices a jump trick.

A snowboarder rides a chair lift.