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.