YOU SAID:

I can't believe how much that hurt

INTO JAPANESE

それがどれほど痛いか信じられない

BACK INTO ENGLISH

I can't believe how painful it is

INTO JAPANESE

なんて辛いのかわからない

BACK INTO ENGLISH

I don't know how spicy it is

INTO JAPANESE

辛いのかわかりません

BACK INTO ENGLISH

I don't know if it's spicy

INTO JAPANESE

辛いのかわかりません

BACK INTO ENGLISH

I don't know if it's spicy