We used to could use it.
source:
LAGS
Entry:
681
Example:
We used to could use it.
Modal 1:
used to
Modal 2:
could
Gender:
Male
Race/Ethnicity:
Black
Age:
72
Level of Education:
6th grade
Home Community, Town, or State:
FL (Cedar Key)
Location Collected:
FL (Cedar Key)
Year:
1974
Relation to Addressee:
subject to fieldworker
Medium:
Spoken
Sentence Structure:
1.0
Status:
Naturalistic