Halliday & Matthiessen (2014: 471):
The principal categories are set out in Table 7-9, together with a summary of the principal markers of extending clause nexuses. As can be seen from the table, the gaps in the paradigm are found particularly with ‘hypotaxis’, and we can relate this fact to the skew in frequency between ‘parataxis’ (around 94%) and ‘hypotaxis’ (around 6%) in text…