Sentence examples for have once existed from inspiring English sources

Of the huge numbers that must have once existed, only a fraction remain.

These are only a fragment of the student records that must have once existed and include those for 113 graduates between 1894 and 1963.

America has deployed drones into these power vacuums, causing ferocious backlashes against central governments while destroying any positive image of the United States that may have once existed.

These formations are significant because they suggest that running water may have once existed on Mars - one of the conditions needed to support life as we know it.

MARCH Early March: Odyssey spacecraft finds evidence that vast regions of Mars may abound in water, suggesting that life could have once existed on the planet.

A major challenge of Mars exploration is to learn when and how liquid water could have once existed on the planet, now cold and arid.

It created a forest where tidal mudflats had once existed.

A cafeteria had once existed in the State House, but it closed in 1990.

The ancients took it for granted that the Homeric heroes had once existed; some families claimed descent from them.

Wouldn't my students ask, "Isn't it possible that the Oral History had once existed, and even that it still exists?

All told, the McKinney case might seem to mark a victory for ideas of sexual equity that had once existed only on the fringes of American culture.