Your nephew is visiting your house. He seems to be cold. You offer to turn the heat up.
You're at your uncle's house. It's pretty cold. You'd like your uncle to turn the heat up, and you also want to know why it's so cold there. You ask him this question.
You're talking to your friend about a book that you recently read. It was a really good book, so you stayed up late every night reading. You say this to your friend to explain why.
You bought a helmet and pads to wear while riding your bicycle. Now you're looking at yourself wearing them in the mirror, and you don't like how it looks. You think this to yourself.
You're talking to your college academic advisor about which classes you should take next semester. He asks you if you know a certain professor. You think you might know who he's talking about, but you're not sure. You ask him this.