SFL: Textual Metafunction

What is the textual metafunction ?

Identify the theme in : " despite the rain , they continued playing football

Which of the following is not a type of cohesion ?

Theme and rheme are not important in structuring coherent text

SFL focuses only on grammar rules and sentence structure

Which sentence uses substitution cohesion

The textual metafunction is responsible for organizing language to create coherence and cohesion