Past participle of be used with have/has/had

• Expresses prior or continuing state, identity, or location
• In have been to, means visited and returned

be 的过去分词，与 have/has/had 连用

• 表示先前或持续的状态、身份或所在
• 在 have been to 中表示去过并已回来

Past participle of be used as an auxiliary

• Forms the perfect passive with a past participle
• Combines with a present participle for the perfect progressive

作为助动词的 be 的过去分词

• 与过去分词构成完成时被动
• 与现在分词构成完成进行时