Thúl eðelío - s/he built a house. Eðelín thúl - a house was built (literally they built a house.)

the usage of passive depends on the animacy of the agent and the patient, and if the agent is expressed or not.

if the agent is an animate, then one simply move the object to the front to express passive:

-- res keb hat tak - he/they attacked the person

-- hat tak res keb - the person was attacked by him/them

if the agent is not expressed, the aux verb ez("get") is used:

-- hat tak keb - the person was hit/attacked(by someone/something)

if the agent is an inanimate, the aux verb ez("get") is used, and the agent is marked with bar("to hold"):

-- hat tak ez keb bar hi tom - the person was hit by a rock.

-bu, and it's identical to the causative suffix.