it is unknown that aliens exist
The unknown creature lay asleep in front of our eyes.
The total amount of people that were there was unknown, but it was over 2000.
I want to discover a previously unknown planet with my new telescope.
It is unknown whether cell phone use has an effect on a person's intelligence
The unknown singer on the street corner was a sensation with all the riders on the bus: they filled her hat with money.
A sentence with unknown can be I am unknown by the people at school.
its unknown
are unknown
Unknow isn't a word, but "unknown" is. Sentence: The world of aliens is still UNKNOWN to humans.
Many things in space are still left unknown.
The unknown creature lay asleep in front of our eyes.
The total amount of people that were there was unknown, but it was over 2000.
unknown
The Unknown - 2012 Life Sentence 1-4 was released on: USA: 2012
The cause of the explosion was unknown.An unknown assailant broke in and hurt the homeowner.
They tried to identify the unknown character.
They were determining the unknown factor.