YOU SAID:
I bet Garfield was a big boy
INTO JAPANESE
ガーフィールドは大きな男の子だったに違いない
BACK INTO ENGLISH
Garfield must have been a big boy
INTO JAPANESE
ガーフィールドは大きな男の子だったに違いない
BACK INTO ENGLISH
Garfield must have been a big boy
You've done this before, haven't you.