YOU SAID:

i am so tired i could eat a horse

INTO JAPANESE

とても疲れているので馬を食べてもいいくらい

BACK INTO ENGLISH

I'm so tired I could eat a horse

INTO JAPANESE

とても疲れたので馬を食べてもいいくらい

BACK INTO ENGLISH

I was so tired that I could eat a horse.

INTO JAPANESE

とても疲れていたので馬を食べることができました。

BACK INTO ENGLISH

I was so tired that I could eat a horse.