My challenge is to stay positive when I spend most of my time with a person whose nature is to be negative. I start the day out with a positive attitude. By mid-morning I hear negative sentences flowing from my mouth as a result of the words that my significant other bombards me with. I have tried changing the subject, responding with something positive about the situation, or just walking away. Those tactics are generally unsuccessful over the long run. Does anyone have any practical tips or ideas?