The only reason for being that was left me - He looked up and around the tank - was in here.

The reason his appearance is such a shock is left deliberately ambiguous.

Now, thought Wanda Seldon bitterly, what reason is left for them to stay?

Launcelot's reasons for wanting to leave Shylock at this particular moment are left vague.

The officer said the real reason might be better left to experts to determine.

In short, the Spirit seemed to have a voice and power but for some reason was left with nothing to say.

The reason and manner of their end were left unrevealed.

The patient is then far more likely to respond favourably to the proposal than if the reasons for it are left vague.

In the songs the reasons for his behavior were left obscure.

The psychological reasons for this are best left to scientists, but the fact is unmistakable.