You used to could.
source:
LAGS
Entry:
637
Example:
You used to could.
Modal 1:
used to
Modal 2:
could
Gender:
Female
Race/Ethnicity:
White
Age:
54
Level of Education:
High school (Graduate)
Home Community, Town, or State:
FL (Whitney)
Location Collected:
FL (Whitney)
Year:
1977
Relation to Addressee:
subject to fieldworker
Medium:
Spoken
Sentence Structure:
1.0
Status:
Naturalistic