ich hätte wissen müssen, dass

I should have known that

→ ich
phrase Rare #38,434
I should have known that Used to express regret or surprise after realizing something that was not known at the time.
GE: Ich hätte wissen müssen, dass du heute frei hast.
EN: I should have known that you had today off.

Ich hätte wissen müssen, dass ich ihm nicht trauen kann.

I should have known that I couldn't trust him.

— Picknick (1955)

Ich hätte wissen müssen, dass Sie hier sind, Professor McGonagall.

I should have known you were here, Professor McGonagall.

— Harry Potter und der Stein der Weisen (2001)

Ich hätte wissen müssen, dass es Zeitverschwendung war.

I should have known it was a waste of time.

Ich hätte wissen müssen, dass sie mich wie einen alten Sack sitzen lässt.

I should have known she’d dump me like an old sack.

— Audition (2000)

Ich hätte wissen müssen, dass Tom es getan hat.

I should have known that Tom did it.