Used to couldn't.
source:
LAGS
Entry:
622
Example:
Used to couldn't.
Modal 1:
used to
Modal 2:
couldn't
Gender:
Male
Race/Ethnicity:
Black
Age:
74
Level of Education:
Some school; illiterate
Home Community, Town, or State:
MS (Sherard)
Location Collected:
MS (Sherard)
Year:
1977
Relation to Addressee:
subject to fieldworker
Medium:
Spoken
Sentence Structure:
unknown
Status:
Naturalistic