The phrase "duly formed" is correct and can be used in written English.
It is generally used to describe something that is properly or legally established according to the requirements of the law. For example, "The will was duly formed in accordance with the law."
Minds tend to be made up early and habits duly formed.
The king then sent for Ramsay MacDonald, the leader of the second largest party, who duly formed a minority government which lasted about eight months.
At a second referendum, in 1997, over 74% of Scots voted for a parliament, which was duly formed, under the leadership of a Labour minister, Donald Dewar.This manoeuvre was thought to have spiked the separatists' guns.
The Chief Judge of the 10th Circuit duly formed a Judicial Council which declared that it had no such powers.
A year later, Anderson proposed a special RAAF workshop for research and development, which was duly formed at Point Cook later that year.
Law, who had few allies outside his own party, lacked sufficient support to form a new coalition; the Liberal Lloyd George, on the other hand, enjoyed much wider support and duly formed a majority-Conservative coalition government.
A small queue duly forms.
Daniels wants to know how the man and the style - indistinguishable, of course - were formed, and duly gives us his influences and the world in which he grew up.
Some several hundred devoted patriots duly arrived to form a human chain around the parliament: "Hands off our parliament," they demanded.
UUK duly withdrew its advice, which formed part of a series of "case studies" describing the appropriate response to various external speakers who wanted to appear on campus.
Duly filled forms submitted by each hospital were reviewed and systematic reporting of number of patients screened, admitted and outcome for each hospitalized patient was ensured.
