Questions & Answers about dào xīnjū yǐhòu zài chāixiāng.
Here 到 means to arrive at or to reach.
So 到新居以后 means after arriving at the new home.
In this sentence, 到 is part of the action that happens first, and 拆箱 is the action that happens later.
In Mandarin, 以后 usually comes after the whole word or phrase that it refers to.
So:
到新居以后 = after arriving at the new home
It is not just modifying 新居 by itself. It is attached to the whole idea 到新居.
A useful pattern is:
[event / time] + 以后 = after [event / time]
Examples:
- 吃饭以后 = after eating
- 下课以后 = after class
- 到新居以后 = after arriving at the new home