YOU SAID:

I guess a sword made of cardboard is useless

INTO JAPANESE

段ボール製の刀は役に立たないと思います

BACK INTO ENGLISH

Corrugated cardboard of the sword is useless and I think

INTO JAPANESE

剣の段は役に立たないと思う

BACK INTO ENGLISH

Think of the sword is useless

INTO JAPANESE

剣の考えは役に立たない

BACK INTO ENGLISH

Thoughts of the sword is useless

INTO JAPANESE

剣の思考は役に立たない

BACK INTO ENGLISH

Thinking of the sword is useless

INTO JAPANESE

剣の思考は役に立たない

BACK INTO ENGLISH

Thinking of the sword is useless