The man went to great lengths to prove that the diamonds were real.
问题描述：
The man went to great lengths to prove that the diamonds were real.
是什么从句 to great lengths 是定吗
to prove 是状吗
答
prove后面跟了个宾语从句吧.
go to great length 是个短语作谓语啊.to prove 应该是目的状语.