An existential or copulative element tends to be omitted more often in a construction which involves a full predication such as a noun complement, a locative complement, or a clausal subject.
Standardized
An existential or copulative element tends to be omitted more often in a construction which involves a full predication such as a noun complement, a locative complement, or a clausal subject than otherwise.
If exist/cop is omitted in full predication, then it is also omitted otherwise.See ##1977, 1981