The New Pali Course Part III (1950)
Prof. A. P. Buddhadatta Maha Nayaka Thera

Chapter III Passive Forms

Future forms paccissati, etc. are to be constructed only by inserting -issa between the base and the personal endings of the Present forms.

66. Some more passive bases.

* ~naa (to know) + ya = ~naaya (to be known)
* bhida (to break) + ya = bhijja (to be broken)
* disa (to see) + ya = dissa (to be seen or to appear)
* hana (to kill or hurt) + ya = ha~n~na (to be killed; to be injured; to take trouble)
* chida (to cut) + ya = chijja (to be cut or broken)
* muca (to release) + ya = mucca (to be free)
* .daha (to burn) + ya = .dayha (to be burnt)
* gaha (to take) + ya = gayha (to be taken)

(a) The final h of the root and y of the sign are always interchanged. (See the last two examples)

(b) The initial va of some roots is changed to vu before the Passive sign ya:

* vaca (to say) + ya + ti = vuccati, is told or called
* vaha (to bear) + ya + ti = vuyhati, is borne or floated
* vasa (to live) + ya + ti = vussati, is practised

vasa is an intransitive having the mean 'to live'. Its passive form has the meaning 'to practise something'.

(c) The roots ending in aa change their vowel to ii before ya:

* dhaa (to bear) + ya + ti = dhiiyati, is borne

ref: http://www.tipitaka.net/pali/synthesis/pali3.00.cdv

(to be continued...)