对下面的句子进行语法分析： "She gave the flowers to her best friend, who was feeling down."
"She gave the flowers to her best friend, who was feeling down."
句子主要由两个分句组成，用逗号连接。第一个分句是"She gave the flowers to her best friend"，主语是"she"，谓语是"gave"，宾语是"the flowers"，间接宾语是"her best friend"。第二个分句是"who was feeling down"，描述"her best friend"，用关系代词"who"引导定语从句。这个从句的主语是"who"，谓语是"was feeling"，宾语补足语是"down"。