"What possible reason could you have to leave me behind?"

But officials in Washington decided not to do so, for several possible reasons.

I can think of at least two possible reasons why.

But there could be only one possible reason for such a turn of events.

"And what possible reason could I have to do that?"

But then there is another possible reason in this system.

There's another possible reason, and it makes the most sense.

"What possible reason would we have not to run it?"

If not then what other possible reason would there be for so much product.

The question as to what possible reason the security officer could have for doing that was quickly followed by the answer.