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: Two guys barbecuing, one in blue shirt bending down, while the other in black shorts stands facing his back to the camera. Sentence 2: Dinner is being prepared by the two brothers.
Two men are barbecuing.

Sentence 1: A guy in a white shirt skateboarding on a ramp. Sentence 2: There is a man doing a trick in the air.
A skateboarder rolls along.

Sentence 1: Several children standing in front of a building. Sentence 2: A group of children are standing in front of a tall apartment building.
A tall building a with a group of children standing in front.