Changed into negative and interrogative form

Changed into negative and interrogative form.

      1.   They used to play tennis twice a week.

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      2.   I used to go to the gym three times a week.

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      3.   Tennis used to be a sport for rich people only.

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      4.   My father used to take me to see soccer games on Saturday.

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      5.   He used to buy a new tennis racket.

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