YOU SAID:
the big apple is surely not that big
INTO JAPANESE
大きなリンゴは確かにそれほど大きくない
BACK INTO ENGLISH
A big apple is certainly not that big
INTO JAPANESE
大きなリンゴは確かにそれほど大きくありません
BACK INTO ENGLISH
A big apple is certainly not that big
That didn't even make that much sense in English.