YOU SAID:

i had four sets of ponies

INTO JAPANESE

私はポニーの4つのセットを持っていました

BACK INTO ENGLISH

I had 4 sets of ponies

INTO JAPANESE

私は4組のポニーを持っていました

BACK INTO ENGLISH

I had 4 pairs of ponies

INTO JAPANESE

4組のポニーがいた

BACK INTO ENGLISH

There were 4 pairs of ponies

INTO JAPANESE

ポニーの4つのペアがありました

BACK INTO ENGLISH

There were four pairs of ponies

INTO JAPANESE

ポニーの4つのペアがありました

BACK INTO ENGLISH

There were four pairs of ponies