YOU SAID:
my neighbors horse neighed yesterday
INTO JAPANESE
私の隣人の馬は昨日いなかった
BACK INTO ENGLISH
my neighbor's horse was gone yesterday
INTO JAPANESE
私の隣人の馬は昨日いなくなった
BACK INTO ENGLISH
My neighbor's horse disappeared yesterday
INTO JAPANESE
近所の馬が昨日いなくなった
BACK INTO ENGLISH
My neighbor's horse disappeared yesterday
You should move to Japan!