The police hurried to the house only to find (that) it was empty.这句话是属於啥句形或是用啥语法?属於啥从句?

问题描述:

The police hurried to the house only to find (that) it was empty.这句话是属於啥句形或是用啥语法?
属於啥从句?

重点是only to,后面引导的that从句的意思出乎意料,表示转折,与turn out 很相似

only to 加结果, 表示出乎意料地发现

it was empty是find的宾语从句