请问这个英语句子是什么结构?逗号后面的动名词做什么成分?

问题描述:

请问这个英语句子是什么结构?逗号后面的动名词做什么成分?
one side of the questionnaire contained a note from the owner,beginning with the words "I really want to know!"

主谓宾加补语
主语:one side of the questionnaire
谓语:contained
宾语:a note
状语:from the owner
补语:beginning with the words "I really want to know!",补充修饰宾语