Halliday & Matthiessen (2004: 386):
Conjunctions may be used to mark the secondary clause in both parataxis and hypotaxis; but different classes of conjunction are used. With parataxis, linkers are used, but only when the logico-semantic relation is one of expansion. Linkers may also serve a cohesive function. With hypotaxis, binders are used, in the environment of both projection and expansion and also, in the case of certain non-finite clauses, conjunctive prepositions. Both parataxis and hypotaxis may involve correlative conjunctions, where a second conjunction marks the primary clause.