① 现代大学英语精读3第二版 unit 3 句子语法分析 a great many people taking tea in a chinese pagoda,
可以看作是现在分词的独立主格结构。
A great many people是现在分词的逻辑主语 taking tea in a chinese pagoda, 是现在分词短语and he behaving like a maniac about the wasps是并列的专独立主格结构属---waving them away, flapping at them with his straw hat是现在分词短语作伴随状语修饰前面的现在分词, serious and infuriated out of all proportion to the occasion.是形容词短语作结果状语修饰前面的现在分词。
供参考，欢迎有更好的见解。