YOU SAID:
The canoe was bobbing violently
INTO JAPANESE
カヌーは激しく揺れていた
BACK INTO ENGLISH
The canoe was shaking violently
INTO JAPANESE
カヌーは激しく揺れた
BACK INTO ENGLISH
The canoe shook violently
INTO JAPANESE
カヌーは激しく揺れた
BACK INTO ENGLISH
The canoe shook violently
Come on, you can do better than that.