Re: those irregular prepositions

Senjecas has two groups of postpositions referred to as derivative
and non-derivative.

Non-derivative postpositions are those which exist in and of
themselves and are not derived (duh!) from verbs.  Postpositions
characteristically end in -a, although there are a few monosyllables
that don't such as _be_, "outside."

Examples of non-derivative postpositions are _cóma_, "outside," and
_áða_, "among."

An example of a derivative postposition is _þríísta_, "in spite of,"
from the verb _þrîîsta_, "to defy."

There is never any confusion since postpositions belong to the group
of words (postpositions, conjunctions and adverbs) which have only
seconday pitch.  Verbs belong to the group (verbs, nouns, adjectives
and interjections) which have a primary pitch.

Also a postposition would never occur at the end of a sentence.  On
the other hand the verb is always the last element in a sentence.

Charlie