YOU SAID:
my grandma drives a motorcycle in the house
INTO JAPANESE
おばあちゃんが家の中でバイクを運転している
BACK INTO ENGLISH
Grandma is driving a motorcycle in the house
INTO JAPANESE
おばあちゃんは家の中でバイクを運転しています
BACK INTO ENGLISH
Grandma is driving a motorcycle in the house
That didn't even make that much sense in English.