wir dachten, du wärst

we thought you were

→ wir
phrase Rare #41,791
we thought you were Used to report a past belief or assumption about someone. “Wärst” is the subjunctive form of “sein” used here in indirect speech or for a hypothetical statement.
GE: Wir dachten, du wärst schon zu Hause.
EN: We thought you were already home.

Wir dachten, du wärst weg.

We thought you were gone.

— Harry Potter und der Feuerkelch (2005)

Wir dachten, du wärst längst auf dem Weg nach Australien.

We thought you’d have left for Australia by now.

Wir dachten, du wärst tot.

We thought you were dead.

— Reservoir Dogs - Wilde Hunde (1992)

Wir dachten, du wärst drin und tot.

We thought you were inside and dead.

— The Big Sick (2017)

Wir dachten, du wärst längst in Australien.

We thought you’d been in Australia for ages.