Your coat is where you left it.在语法上怎么理解?

问题描述:

Your coat is where you left it.在语法上怎么理解?
where引导的是什么从句啊?状语从句么?请详细说明一下.

这个句子中where引导的是表语从句,但如果改为Your coat is in the place where you left it.则where是引导定语从句,修饰先行词the place