was sure that
Sie war sich sicher, dass der Mann log.
She was sure the man was lying.
Tom war sich sicher, dass Maria log.
Tom was sure that Maria was lying.
Er war sich sicher, dass in dem alten Palast riesige Schätze sind.
He was certain that there were enormous treasures in the old palace.
— Das Schloss im Himmel (1986)
Maria war sich sicher, dass Tom das nicht tun werde.
Maria was sure that Tom wouldn’t do that.