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 employees knead and prepare dough for use with making cakes as seen through the window. Sentence 2: Two employees kneading dough before a large baking competition.
Two employees kneading dough.

Sentence 1: A group of people riding on a crowded bus. Sentence 2: The bus was full.
People were on the bus.

Sentence 1: A boy with a blue shirt travels on a skateboard past a Blockbuster video store on the corner. Sentence 2: A teenaged boy in a hat skateboards past a closed video store.

The boy is riding a skateboard.