Since early 1980s, Noam Chomsky and other generative linguists proposed and developed a theory of universal grammar(UG) known as the principles-and parameters theory.

• 从20世纪80年代早期开始，诺姆*乔姆斯基和其他一些生成语言学家就提出并发展了一套普通语法理论（UG），称为原则及参数理论。