http://www.passporttoenglish.com/Advanced-English/Lesson8/Grammar.html
| When we use used to, we are talking about something which happened regularly or was true at an earlier stage in our lives but which is now over. Thus, it can only be used in the past tense. If we want to talk about present habits or states, we simply use the present simple tense. With the negative we often say never used to in preference to didn't use to or used not to - in an informal register. Study the following examples:
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| To make questions, we use the normal auxiliary did. Note that used to cannot be used in question tag form. Note also the possible/probable replies to used to questions. Study the following examples:
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