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!"

这是个复合句，主句是one side of the questionnaire contained a note from the owner，从句是beginning with the words "I really want to know!"动名词beginning及后面部分都是修饰主句中the ower的，应该是叫宾语补足语。

整个句子为主谓宾结构。
one side of the questionnaire 为主语；contained为谓语；a note from the owner为宾语。
后面的beginning短语不是动名词，而是现在分词短语，此处的现在分词短语作为定语，修饰
note。 beginning with the words "I really want to know!"相当于一个定语从句：which begins with the words "I really want to know!"
祝你进步！

我建议听四楼的~~~

这是一个简单句。
句子主干是"One side of the questionnaire contained a note from the owner" 后面部分的现在分词作状语，表伴随情况。

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