Subordination - nominalization
Formatives to embed clauses. The first may be exemplified by English that, German daß, Welsh a and Nahuatl in. Here a demonstrative is used to announce the embedded clause. Then a mechanism sets in which prescribes that whatever is preceded (or followed, as the case may be) by a demonstrative as a coconstituent must be a nominal. So the embedded clause is nominalized by coercion, and the demonstrative degenerates to a mere subordinator.
Cabecar light verbs and postverbal clitics.
Genesis of auxiliaries in Yucatec
Periphrastic aspect.