Sentence examples for once have from inspiring English sources

That would once have been laughable.

This cityscape might once have been London.

It did once have an aesthetic sensibility.

This idea may once have had validity.

Such purchases would once have gone unquestioned by economists.

Not once have I been thanked by the flight attendants.

But not once have I ever felt lonely.

However, only once have they lost the next match.

There may once have been some oil wells there too.

I.S.D.S.-style provisions may once have made sense.

Manufacturing would once have stepped up to the plate.