YOU SAID:

I bet this one's gonna be a blast

INTO JAPANESE

私はこれが爆発になるだろうに違いない

BACK INTO ENGLISH

I bet this will be an explosion

INTO JAPANESE

これは爆発に違いない

BACK INTO ENGLISH

This must be an explosion

INTO JAPANESE

これは爆発でなければなりません

BACK INTO ENGLISH

This must be an explosion