The phrase "formed a base" is correct and can be used in written English.
It means to establish a starting point or foundation for something. Example: The company formed a base in the city and began to expand its reach to neighboring towns.
It is taking United time to accustom themselves to the two-tier midfield system, in which Phil Neville, Roy Keane and Quinton Fortune formed a base in front of the defence, while Ryan Giggs and Ronaldo sought to keep in touch with Van Nistelrooy.
While Twitter is the fundamental platform that formed a base for many applications, such as TweetDeck, Seesmic, PeopleBrowsr and Sobees, these platforms soon looked to other social networks such as Facebook, MySpace and FriendFeed for additional integration.
Her court was replete with Germans and Dutch, who formed a base for the interests of the House of Habsburg.
Tresco formed a base for Royalist privateers, and Parliament became concerned that the Dutch, then hostile to England, might counter the piracy by occupying the islands, gaining a foothold they could then use against England.
The castle was the subject of the six-month-long Siege of Kenilworth in 1266, believed to be the longest siege in English history, and formed a base for Lancastrian operations in the Wars of the Roses.
These castles formed a base for the royal sheriff, responsible for enforcing royal justice in the relevant shire; the role of the sheriff became stronger and clearer as the century progressed.
While lifetime learning is a given, these competencies form a base for professional growth.
"The big, floppy glaucous-blue leaves form a base that looks like a giant cabbage.
"Generally we are forming a base in the housing sector this year," he said.
They hope the work will form a base line so that similar future efforts can track citywide and local changes.
It assists in extracting perfumes from flowers, forms a base for medical ointments, and supplies a waterproof coating for wood.
