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Used to or use to
If we say something used to happen we are talking about repeated eventsand actions in the past, usually things that happened a long time ago and are now finished.
To express thiswe can use: use to or used to
If you want to talk about repeated states or habits in the past, you must use used to, you cannot use would:
EXAMPLES:
* My dog used to bark at cats.
* I usedto smoke.
* I used to be an administrative assistant.
* I used to live in England.
You should use 'use to' without a d in sentences when it follows 'did' or 'didn't' (don't worry too muchabout this because lots of people get it wrong).
The question form is ‘Did you use to…?'. When asking a closed question you put did/didn't in front of the subject followed by use to, you cannot usewould.
EXAMPLES
Did you use to go out with my sister?
Did they use to own the company?
Didn't we use to go to the same school?

ABOUT NEGATIVE QUESTIONS
We use negative questions to show surprise,in exclamations and when we expect the listener to agree with us.
Utilizamos la preguntas negativas para demostrar sorpresa, en exclamaciones y cuando esperamos que quien nos escucha esté de acuerdocon nosotros. |

1. TO SHOW SURPRISE (Para demostrar sorpresa) |
Didn't you hear the bell? I rang it four times.
(¿No escuchaste el timbre? Toqué tres veces.) |
2. IN EXCLAMATIONS (Enexclamaciones) |
Doesn't that house look beautiful! (= that house looks really beautiful)
(¡No sé ve hermosa esa casa! (= esa casa es realmente hermosa) |
3. WHEN WE EXPECT THE LISTENER TO AGREE WITH US    (Cuando esperamos que el oyente esté de acuerdo con nosotros) |
"Haven't we met somewhere before?" "Yes, I think we have." 
("¿No nos hemos visto antes en alguna parte?" "Sí, creo que sí.") |NOTICE THE MEANING OF YES AND NO IN ANSWERS
TO NEGATIVE QUESTIONS: |
Didn't Roberto pass his exams? 
Yes. (= Yes, he passed them.)
No. (= No, he didn't pass them.) |
NOTICE THE WORD ORDER...