FORM
AFFIRMATIVE (+)
| S + used to + V | |
| I | I used to work |
| we | we used to work |
| you | you used to work |
| they | they used to work |
| he | he used to work |
| she | she used to work |
| it | it used to work |
NEGATIVE (–)
| S + did + not + use to + V | |
| I | I did not use to work |
| we | we did not use to work |
| you | you did not use to work |
| they | they did not use to work |
| he | he did not use to work |
| she | she did not use to work |
| it | it did not use to work |
| did not = didn't |
INTERROGATIVE (?) — General questions (or "Yes/ No") questions
| did + S + use to + V … ? | |
| I | did I use to work |
| we | did we use to work |
| you | did you use to work |
| they | did they use to work |
| he | did he use to work |
| she | did she use to work |
| it | did it use to work |
INTERROGATIVE (?) — Special (or "Wh") questions
To make a "Wh" question we usually put a question word (QW) before a construction of "Yes/No" questions:
E.g.
| Past Simple |
| QW + did + S + use to + V … ? |
| Why did you use to work … ? |
| When did he use to work … ? |
SHORT ANSWERS
| Yes, S + did. | No, S + didn't. |
| Yes, I did. | No, I didn't. |
| Yes, we did. | No, we didn't. |
| Yes, you did. | No, you didn't. |
| Yes, they did. | No, they didn't. |
| Yes, he did. | No, he didn't. |
| Yes, she did. | No, she didn't. |
| Yes, it did. | No, it didn't. |
Svarīgi!
NOTE!
In short answers we use pronouns (I, we, you, they, he, she, it).
E.g.
— Did Mary use to play tennis when she was ten?
— Yes, she did. (NOT: Yes, Mary did.)
***
V — Verb (the infinitive of the verb without "to"/ Present Simple verb (for I, we, you, they). E.g. write, go, listen, etc.
S — Subject of the sentence
QW — Question word (E.g. what, when, where, why, who, how)