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 man using a notepad and pen to diagram an image. Sentence 2: A young man using a red pen with a notepad.
A young man using a pen and notepad.

Sentence 1: Six people, four male and two female, hanging out in a living room. Sentence 2: The males in the room are drinking beer.
There are people in the house.

Sentence 1: a dirt biker performs a trick in midair. Sentence 2: The dirt biker is a girl.

A person is riding a two-wheeled vehicle.