ich dachte, ihr wärt

I thought you were

→ ich
phrase Rare #43,626
I thought you were “Ihr” addresses more than one person informally. “Wärt” is the subjunctive form of “to be.”
GE: Ich dachte, ihr wärt schon zu Hause.
EN: I thought you were already at home.

Ich dachte, ihr wärt alle tot.

I thought you were all dead.

— Train to Busan (2016)

Ich dachte, ihr wärt ein Team.

I thought you were a team.

— Reservoir Dogs - Wilde Hunde (1992)

Ich dachte, ihr wärt schon weg.

I thought you’d already left.

— Der Club der toten Dichter (1989)

Ich dachte, ihr wärt anders, aber ihr seid auch Schweine!

I thought you were different, but you're pigs too!

— Y Tu Mama Tambien - Lust for Life (2001)

Ich dachte, ihr wärt schon im Bett.

I thought you were already in bed.

— Nobody Knows (2004)