Dear, can you drive me to the clinic?
I'm afraid I can't.
Why?
Well, my car won't start. I don't know what's the matter with it.
Could it be the battery?
No, I don't think it could be. I checked the battery two days ago. It must be other problems.
Well, I suppose it could be the gas.
No, there is plenty of gas. I filled it up yesterday.
Perhaps it's the starter then?
Yes, that's possible.