Water is the only common substance that exists at the Earth's surface as a solid, a liquid, and a gas.
(Water; is; the only common substance that exists at the Earth's surface as a solid, a liquid, and a gas) (the only common substance; exists; L:at the Earth's surface)
Water the only common substance
is exists
the only common substance that exists at the Earth's surface as a solid, a liquid, and a gas
L:at the Earth's surface