YOU SAID:

i am sitting on a bed in my grandparent's room

INTO JAPANESE

私は祖父母の部屋のベッドに座っています

BACK INTO ENGLISH

I'm sitting on the bed in my grandparents room

INTO JAPANESE

祖父母の部屋のベッドに座っている

BACK INTO ENGLISH

sitting on the bed in grandparents room

INTO JAPANESE

祖父母の部屋のベッドに座る

BACK INTO ENGLISH

sit on the bed in grandparents room

INTO JAPANESE

祖父母の部屋のベッドに座る

BACK INTO ENGLISH

sit on the bed in grandparents room