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I used to eat a lot of meat

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I used to take swimming classes when I was little.

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I used to go out with my family all weekends.

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I used to play violin every Tusday.

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I used to have long hair.

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I use to pay basketball with my brothers.

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Like with the negative form,  the auxiliary 'did' takes the role of the 'd' of 'used to'.
did+sibj+use to+verb in the infinitive
Example:
- Did I use to live with my father?
Did she use to swim every weekend

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In this form the 'd' of "used to" is omitted because the auxiliary 'did' does its job:
subj+did+not+use to+verb in the infinitive
Example:
- I did not use to live with my father.
- She use to swim every weekend.

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subj+used to+verb in the infinitiveinfinitive
Example:
- I used to live with my father.
- She used to swim every weekend.

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We use "Used to.." to talk about things, to describe a long lasting action, a state or a habit  that we did in the past but maybe we don't do in the present.