YOU SAID:

That's understandable. It must have been

INTO JAPANESE

それは理解できます。だったに違いない

BACK INTO ENGLISH

I understand that. Must have been

INTO JAPANESE

という事は承知しています。されている必要があります

BACK INTO ENGLISH

I know that. Must have been

INTO JAPANESE

そんなこと知ってる。されている必要があります

BACK INTO ENGLISH

I know that. Must have been