不规则动词
中文翻译：过去
同义词：
['once', 'in the past']
例句：
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1. I remember when we used to play together on weekends.
我记得我们以前周末经常一起玩。
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2. She told me about her trip to Europe once she visited there.
她告诉我她去欧洲旅行过。
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3.He mentioned that he had a great time at the party once he went there.
他提到他去那里参加派对时玩得很开心。