Interested in Language
Is it permissible for me to use passive without auxiliary verb?
(1) I think that in most cases, the answer is NO.
(2) The passive is usually defined as a form of "to be" + the past participle:
You can speak English. > English is spoken by you.
The teachers here treat all members with respect. > All members are treated with
respect by the teachers here.
You should study your lessons with great diligence. > Your lessons should be
studied with great diligence (by you).
P.S. In informal English, you may sometimes omit the auxiliary. For example,
if you own a store that sells things to English-speaking tourists, it's fine to put
this sign in the window: English spoken here. (Instead of "English is spoken here
by the staff.")
You can also use get instead of be sometimes- The house got painted, instead of The house was painted.