You gave a presentation at an event for people to practice giving speeches in English. Now you've opened the floor for questions. A few different people have raised their hands to ask a question, and you need to pick one of them. You say this and ...
You come home after work, and your wife is cooking fish. You were able to smell it before you even came in the door. When you come in, you say this.
You're watching the news and you hear some news about a volcano. This is what the newscaster says.
You're giving a presentation of your company's newly redesigned website. You want to list the good points of this new site, so you say this.