An Introduction to Systemic Grammar

To begin with, the phrase 'level of form' is replaced by the term Texico-
grammatical stratum'. ... of a text, but equally essential to its nature is the use of
various grammatical cohesive devices, e.g. substitution, ellipsis and conjunction,
as explained in Part 2. ... So, whereas grammatical analysis may be performed
over a single sentence, a paragraph or even a whole book, the sentence is more
appropriately ...