YOU SAID:

i'm sad my dog had died

INTO JAPANESE

私は悲しいです 私の犬は死んでいた

BACK INTO ENGLISH

I'm sad my dog was dead

INTO JAPANESE

犬が死んでしまったのが悲しい

BACK INTO ENGLISH

It's sad that the dog died

INTO JAPANESE

犬が死んだのは悲しい

BACK INTO ENGLISH

It's sad that the dog died