Datapoint Cameroon Pidgin English/Predicative noun phrases and predicative locative phrases

There seems to be an overlap with the copula bi which can function as a copula in predicative noun phrases and in predicative locative phrases, possibly under the influence of English be.
However, de does not seem to function as an equative copula, and na does not seem to function as a locative copula.

Values

Identity and differentiation

Example 18-109:
Grace 'bi fo 'hos.
Grace
Grace
bi
cop
fo
for
haus.
house
Grace is at home.

Source: de Féral 1989: 78

Example 18-110:
Grace 'de (fo) 'hos.
Grace
Grace
de
cop
(fo)
(for)
haus.
house
Grace is at home.

Source: de Féral 1989: 78

Example 18-106:
A bi titsha.
A
1sg.sbj
bi
cop
titcha.
teacher
I am a teacher.

Source: de Féral 1989: 77

Example 18-105:
Ma papa na ticha.
Ma
1sg.poss
papa
father
na
cop
ticha.
teacher
My father is a teacher.

Source: Ayafor 2008: 438

Confidence:
Certain