YOU SAID:

the big cat is a big fella

INTO JAPANESE

大きな猫は大きなやつです

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a big cat is a big one

INTO JAPANESE

大きな猫は大きな猫です

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big cats are big cats

INTO JAPANESE

大きな猫は大きな猫

BACK INTO ENGLISH

big cat big cat

INTO JAPANESE

大きな猫 大きな猫

BACK INTO ENGLISH

big cat big cat