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
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