"Goodness! Is that the time?"
Yes. You've just looked at your clock/watch. You know that's the time.
"Is anyone sitting in this chair?"
Look carefully. Can you see anyone? No? Then it may be taken, but there's no one sitting in it, is there?
"Who can that be?" (ie at the door/on the phone. The Archers specialise in this kind of question)
Well, go and see, and you'll find out, won't you?
"Are you all right?" (to someone in flames/lying crushed under a lorry/falling off a cliff)
Well, what do you think? Does s/he look all right? No? Then GET HELP!
There are a lot of these around. Do feel free to contribute any more you may have up your sleeve.