How to use in-sentence of “ufo”:
+ Because of the way they are shaped, they have been offered as an explanation for some UFO sightings.
+ A UFO is any object flying in the sky which cannot be identified by the person who sees it.
+ It is famous for the 1947 Roswell UFO Incident.
+ Lots of people thought a UFO was following behind the comet, even though many astronomers, including Alan Hale, tried to tell them it was just a star..
+ Studies estimate that 50-90% of all reported UFO sightings are identified later.
+ Many people believed it was a UFO or alien spacecraft that crashed.
