3 Four of these sentences have mistakes in them. Find the mistakes and correct them. 1. Our brains allow us planning our lives well, which animals can't do. 2. I always try to working out the best solution to problems by talking them over with friends. 3. I don't want to suggest that planning revenge is in any way a positive move! 4. When people take chances, they can risk to find themselves in difficult situations. 5. I intended to have finished this by Sunday, but now I'm so late there's no chance. 6. I really regret not to have studied harder when I was at school.