我一直弄不懂许多人在庆祝活动上表现出来的极大热情。 第一层: I 是主语; wonderded是谓语; at the passion many people have to meet the celebrated是介词短语作状语,修饰wonderded。 第二层: the passion many people have to meet the celebrated是介词at的宾语。 第三层: 这个宾语中many people have to meet the celebrated是定语从句,修饰the passion。 第四层: 这个定语从句中,to meet the celebrated是目的状语,修饰动词have 。