You're riding the subway in New York City. The train conductor makes an announcement because the train isn't stopping at its usual stops. She says this.
You haven't seen your friend Matt for a few months. You're not sure why he hasn't been in touch. Now you're having a conversation with another friend of your who also knows Matt. You remember that you wanted to ask about him, so you ask this.
Your company recently laid off 15% of the employees. You're running a meeting with your staff to talk about how to deal with the layoffs. After starting the meeting, you begin by saying this.
You use fluorescent light bulbs in your house to save electricity, You're explaining why you use them to acquaintance who says he doesn't know why people use them.