Haidar starts by asking three questions:
Among the many unanswered questions in grammar theory, the following figure prominently.
- First, what is it that enables children to successfully cope with the structural complexities of their mother tongue while professional grammarians tend to fail when modelling them?
- Second, what determines the narrow system corridor for human grammars?
- Third, are the grammars of human languages the offspring of a single proto-grammar instantiating a "Universal Grammar" (monogenic) or are the shared traits of human grammars the result of convergent changes in the grammars of human languages of diverse ancestry (polygenic)?