Question

请高手帮忙分析一下这句话的句子结构，谢谢

Having checked the doors were closed,and that all the lights were off,the boy opened the door to his bedroom

Answer 1

Having checked the doors were closed,and that all the lights were off是定语短语，属于完成时态，主要的动词是check，check后面的都是check+that类型的从句，类似于i think that it will be Ok，本句跟了二个从句“the doors were closed”“all the lights were off”。

主句是the boy opened the door to his bedroom

追问

having checked在句子中做什么成份啊？