R1O1O1F4
7 points
ROOF is validvalid
to provide a building with an external upper covering [v ROOFED, ROOFING, ROOFS]
to provide a building with a covering [v -ED, -ING, -S]
to provide a building with an external upper covering [v ROOFED, ROOFING, ROOFS]
to provide a building with a covering [v -ED, -ING, -S]