passive voice

['itan ayvrrtepyä]

Is there a way to change an active verb into a passive verb as in you have been warned.?
irayo ma aysmuk

[omängum fra'uti]

From Frommer, Na'vi has no passive voice the way we have it in English.  Though really the passive voice doesn't convey any extra information, it just shifts the subject of discourse.  And in Na'vi, you can convey a similar emphasis by changing word order.  For example...

Oel ikranit tswolayon
I rode the ikran

Ikranit oel tswolayon
The ikran was ridden by me

When there is no given subject, implied or otherwise, you can use "fko" as a stand-in, such as in "Pefya ngaru fko syaw?".

Ngati fkol poleng
You were told

Yerikit fkol teraron
The hexapedes are hunted