Editorial : acquisition of clause chaining

Research on the acquisition of complex syntax has largely overlooked a special type of complex sentence, found in hundreds of languages outside Western Europe: the clause chain. A clause chain contains as few as one and as many as 20 or more "medial" clauses, with verbal predicates that are under-specified for tense and other categories, and a single "final" (finite) clause, with a verbal predicate that is fully-specified for tense and, often, other categories. "Medial" clauses relate syntactically to other clauses in the chain without being subordinated to them. In some languages, each clause in a chain must indicate in advance whether the subject of the next clause will be the same as or different from that of the current clause, through "switch-reference" marking (Haiman and Munro, 1983; van Gijn and Hammond, 2016). Unlike English complex sentences, clause chains' distribution is partially predictable in that it is often associated with description of temporally sequential events or actions.