You're a teacher. One of your students is failing the class. You're talking to her about her grades. You say this.
You're walking around your neighborhood with a friend. You notice a group of guys wearing big, baggy jeans. That used to be fashionable several years ago, but you don't think it's cool anymore. You make a comment about it to your friend.
You're discussing social issues with a couple of friends. One issue that's important to you is the environment. You think it's important for your country to develop "green" energy, so you say this.
You're shopping for a new car. You haven't bought a car in many years. When you're looking at the specifications for the cars, you notice that they use a lot less gas than cars that you've owned in the past. You comment on it to the car salesman.