> The Passive or Reflexive is used when the effect or the consequence of
> the action expressed by the verb accrues to no one else but to the agent.

I think that is not quite correct... the correct statement should be (regarding the passive kammavaacaka, anyway):

The Passive is used when the effect or the consequence of the action expressed by the verb accrues to no one else but to the _owner of the verb_.

This is an important distinction, because the owner of a kammavaacaka verb, as opposed to that of a kattuvaacaka (active voice) verb, is clearly not the agent (katta), but rather the patient (kamma). The agent is put in the third case (instrumental) and is not the owner of the verb.

eg

Suudo odana.m pacati (kattuvaacaka)
Suudena odano paciyate (kammavaacaka)
Tena bhuuyate (bhaavavaacaka)
Saamiko suuda.m odana.m paaceti (hetukattuvaacaka)
Saamikena suudena odano paacaapiyate (hetukammavaacaka)

I'm not sure which pali voice the term middle voice refers to, probably bhaavavaacaka. In that case, there is another distinction, at least in the case where the ya is not assimilated; there is an addition of the aagama "i" before the ya in kammavaacaka. eg paciyate, kariyate, etc. The bhaavavaa has no "i". eg. bhuuyate "it is existed (by him)." i.e. he exists.

> 66. Pa~ncamii, the Fourth Mode

Should be Fifth Mode, no?

> Gaccha is the base formed from the root gamu (to go).

root /gam (no "u")

> The Optative (Potential)
>
> 67. Sattamii, the Fifth Mode

Should be Seventh Mode

Best Wishes,

Yuttadhammo (Phra Noah)