I got to their home ,but they weren't in(改为同义句)

问题描述:

I got to their home ,but they weren't in(改为同义句)
They weren't ____ ____ when i got there.
帮忙说下为什么
填下空 说下为什么

be in等于be at home
都是“在家”的意思,可以相互替换,这就是这道题的考点
I got to their home , but they weren't in
=They weren't at home when i got there.