求英语大神分析一下这个句子的成分!There existed certain doubt among the students as to the necessity of the work.
问题描述：
求英语大神分析一下这个句子的成分!
There existed certain doubt among the students as to the necessity of the work.
答
倒装句式.
There existed 谓语
certain doubt 主语
mong the students 状语,修饰整句
as to the necessity of the work定语,修饰certain doubt