An Exploration of Similarities and Dissimilarities between Traditional Grammar and Systemic-Functional Grammar from the Angle of "Mood"

From the angle of mood,the article analyses the specific meaning of mood both in traditional grammar and systemic-functional grammar,with the purpose of finding out similarities and dissimilarities between these two grammatical systems.They are: 1.traditional grammar is less flexible than systemic-functional grammar,but it is easier to memorize;2.Traditional is specific and rigid;systemic-functional is abstract and flexible.