introduction The differences between systemic grammar and other Linguistic theories Firstly, it attaches great importance to the sociological aspects of language Secondly, it views language as a form of doing rather than a form of knowing. It distinguishes potential linguistic behavior from actual linguistic behaviorThe differences between systemic grammar and other linguistictheories: Firstly, it attaches great importance to the sociological aspects of language. Secondly, it views language as a form of doing rather than a form of knowing. It distinguishes potential linguistic behavior from actual linguistic behavior