I used to go swimming怎么改成被动语态

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答：此句句意为：我以前常去游泳.另,句中的动词短语go swimming不能改成被动语态.
句中的短语：used to do sth 意为“过去常做某事”,又如：
The mother still remembers that the boy used to run up to her as soon as he saw her.
The man used to be a very shy boy.
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