事故可能是在夜班期间发生的。
The accident could have happened during the night shift.
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Could英 /kʊd/|美 /kʊd/
解释
could + have + happened 表示对过去事件发生时间的推测。说话人根据已有信息推断事故可能发生在夜班时段，但并不确定。
The accident could have happened during the night shift.
could + have + happened 表示对过去事件发生时间的推测。说话人根据已有信息推断事故可能发生在夜班时段，但并不确定。