YOU SAID:
The horse is at the door
INTO JAPANESE
馬は、ドア
BACK INTO ENGLISH
A horse is a door.
INTO JAPANESE
馬はドアであります。
BACK INTO ENGLISH
Horses are at the door.
INTO JAPANESE
馬は、ドアのところにいます。
BACK INTO ENGLISH
Horses are at the door.
You should move to Japan!