YOU SAID:

This is the fastest horse my dad's ever bought.

INTO JAPANESE

これは私の父が今まで買った中で最速の馬です。

BACK INTO ENGLISH

This is the fastest horse my father ever bought.

INTO JAPANESE

これは私の父が今までに買った中で最速の馬です。

BACK INTO ENGLISH

This is the fastest horse my father has ever bought.

INTO JAPANESE

これは私の父が今までに買った中で最速の馬です。

BACK INTO ENGLISH

This is the fastest horse my father has ever bought.