There are three possibilities:
- copula da (< English that); this cannot be preceded by a negator, TAM marker or auxiliary; it is also clause-introducing [it.be], with pronominal as well as copular functions, in accord with its pronominal origin;
- copula de (< English there);
- no copula.
Source: van Dyk ca. 1765: 31
Source: Weygandt 1798: 87
Source: Schumann 1783: 26
Source: van Dyk ca. 1765: 89
Source: Schumann 1781: 271
Source: CR 1761
Source: Schumann 1783: 117
Source: Schumann 1781: 147