YOU SAID:
the house is on fire and is slowly burning do
INTO JAPANESE
家が燃えていて、ゆっくり燃えています
BACK INTO ENGLISH
The house is on fire and it's burning slowly
INTO JAPANESE
家が燃えていて、ゆっくり燃えている
BACK INTO ENGLISH
The house is on fire and it's burning slowly
That didn't even make that much sense in English.