grammar is taken from a trinocular perspective, meaning from three different levels. So to look at lexicogrammar, we can analyze it from two more levels, ‘above'(semantic) and ‘below’ (phonology). This grammar gives emphasis to the view from above.
For Halliday, grammar is described as systems not as rules, on the basis that

مطلب مرتبط :   پایان نامه درمورد سایزهای، پیل‌های، باتری‌ها، پیلها