Datapoint Sango/Aspect change in verb chains

There is something like verb chaining in Sango, but not the kind found in other African languages. In any case, I cannot imagine the COP being used in such constructions.

Values

Aspect change in verb chains is not possible

Example 59-168:
angba ago asi, lo war mama ti lo ni
a-ngba
pm-remain
a-gwe
pm-go
a-si,
pm-arrive
lo
3sg
wara
find
mama
mother
ti
of
lo
3sg
ni
det
The co-wife went and found her (the girl's biological) mother.
Example 59-169:
ado tanga na azaa
a-do
pm-stamp
tanga
remainder
ni
det
a-zia
pm-refuse
She rejected the remainder.
Confidence:
Certain