modal Auxiliary Verb: Used to

Simple: used to

Subject + used to + Verb¹

Positive: She used to teach.

Negative: She did not use to teach.

Interrogative: Did she use to teach?

Negative Interrogative: Did she not use to teach?

WH-Questions:

• What did she use to teach?
• When did she use to teach?
• Who used to teach?
• Where did she use to teach?
• Which subject did she use to teach?
• How did she use to teach?
• How many students did she use to teach?
• How often did she use to teach?