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6.  I DIDN'T USE TO GET UP EARLY

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5. I USED TO HAVE A CAT

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3. I DIDN'T USE TO PLAY SOCCER BUT NOW I DO

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4. I DIDN'T USE TO BE SO SERIOUS.

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1. I USED TO VISIT TO MY GRANDPARENTS ALL THE SUNDAYS

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2. I USED TO PLAY WITH MY COUSINS

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Like with the negative form, when we want to ask a question about a repeated action, a state, or a habit in the past, the auxiliary 'did' takes the role of the 'd' of 'used to'. The form is as follows:

DID + PERSON + USE TO + VERB + ?

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In this form the 'd' of "used to" is omitted because the auxiliary 'did' does its job:

PERSON + DID + NOT + USE TO + VERB

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As you might have noticed, "USED TO" is followed by a verb in the infinitive without "to" and this is the rule:

PERSON + USED TO + VERB

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We normally use the expression "used to" to talk about an action or, better, a habit in the past and finished. It stopped to exist at the present time.