你去我家干什么
“What were you doing at my house?”
THE DIALOGUE REEL
怎么了这是
“what's all this?”
你 去我家 干什么
“What were you doing at my house?”
放开你的手
“Take your hand off me.”
“Back off! You have no right to set foot in my home.”
The home is regarded as an intensely private domain; an uninvited or hostile approach to someone's home ('我家') triggers strong protective and confrontational defense.
LEARNING CHUNKS & PARTICLES
go to my home / house
A standard spoken phrasing referring to visiting or going over to one's residence.
what for; doing what
Placed at the end of a verb phrase to sharply demand a rationale or purpose, often with annoyance.