YOU SAID:

you've opened this can of worms

INTO JAPANESE

あなたはこのワームの缶を開けました

BACK INTO ENGLISH

You opened the can of this worm

INTO JAPANESE

このワームの缶を開けた

BACK INTO ENGLISH

I opened the can of this worm

INTO JAPANESE

私はこのワームの缶を開けた

BACK INTO ENGLISH

I opened the can of this worm