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 boy in an orange jacket climbes through a play tunnel Sentence 2: The boy is playing with his brother.
The boy is in an enclosed space.

Sentence 1: Two lines of colorful cars racing on a racetrack. Sentence 2: Some brightly colored cars are going extremely fast on a track.
Some cars are racing

Sentence 1: A teacher is giving a lecture. Sentence 2: The teacher is looking at the powerpoint presentation.

The teacher is speaking to the class.