YOU SAID:
Cass's mouth opened just enough to let out a sound of protest.
INTO JAPANESE
キャスの口は抗議の音を出すのにちょうど十分に開いた。
BACK INTO ENGLISH
Cass' mouth was just wide open to make a protest.
INTO JAPANESE
キャスの口は抗議するために大きく開いていた。
BACK INTO ENGLISH
Cass's mouth was wide open to protest.
INTO JAPANESE
キャスの口は抗議するために大きく開いていました。
BACK INTO ENGLISH
Cass's mouth was wide open to protest.
That didn't even make that much sense in English.