The phrase "aliens were not" is correct and usable in written English.
It can be used in contexts discussing the existence or actions of aliens, often in a negative or contradictory statement.
Example: "In the latest report, scientists concluded that aliens were not responsible for the strange signals detected from space."
Alternatives: "extraterrestrials did not" or "beings from other worlds were not".
He said because these aliens were not the good Ellis Island kind.
Except for the bromeliads, aliens were not wildly apparent that morning.
In two of those cases, however, the aliens were not deportable under existing law and thus the Board did not reach the question of discretionary relief.
At that time a new regulation came in that enemy aliens, and of course we were classed as enemy aliens, were not allowed to be within so many miles of the coast because we might be spies.
The central joke in "Men in Black" was so good because it was flexible and expansive and, in a lovely way, utilitarian: The aliens were not snatching our bodies and turning us into pods, as in the old science-fiction tropes; they were ectoplasmic creatures (created by specialist Rick Baker) from outer space who sought refuge on Earth from obscure intergalactic wars.
When local agitator Arnold White said aliens were not persecuted refugees but came "because they wanted our money", supporters shouted from the floor: "Wipe them out!" Local newspapers acknowledged opposition when they commented that 260 "big brawny" stewards "unceremoniously ejected" foreigners.
But when instruments failed to find any organic molecules, which are the building blocks of any organism, scientists concluded that no, aliens weren't living in the dirt.
No, aliens weren't planning to land there.
This discussion about the proper protocols of communicating with aliens is not the most mainstream scientific debate ever concocted.
Crackpots who believe Elvis was kidnaped by aliens are not exclusive to America.
