I'm trying to flesh out the "moods" a bit more, which were broadly based on some kind of mixture of West Greenlandic and languages like Yidiny, amongst others, both of which have inflections which are somewhat structural in nature rather than purely irrealis/subjunctive/... per se.
West Greenlandic
In the case of West Greenlandic, the Routledge Grammar lists:
Primarily main clause
Indicative
Interrogative
Imperative
Optative
Primarily subordinate clause
Causative
Conditional
Contemporative
Participial
The main clause moods primarily distinguish speech acts, with the imperative and optative being more or less different parts of the same paradigm (imperative forms are 3rd person only, optatives are for all persons except 3rd).
In terms of the subordinate forms, the primary functions are:
Causative
- Reason
- Cause
- When
- Consecutive action (i.e. clause chains)
- Sometimes used as a simple past tense in main clauses
Conditional
- Protasis of conditionals, normally in the future
- When
Contemporative
- Simultaneous action
- Manner
- Purpose (with additional affix)
- Concessive
- When
Participial
Yidiny
Dixon's grammar, which is not that easy to extract usage details from, lists:
Main clause
Present-future
Past
Imperative
Subordinate clause
Purposive
Dative subordinate
Causal subordinate
Lest
In terms of the subordinate forms, the primary functions are:
Purposive
- In main clause: optative, hortative, obligation, necessity
- Subsequent action
- Purpose
- Result
Dative Subordinate
- Simultaneous action
- Complement
Causal subordinate
Lest
- Negative potential consequence
They can also be used as complementation strategies, although most of the examples involved either the dative or purposive. Basically they seem to be relative tense forms for prior, simultaneous and subsequent action, with the expected logical-causal relations as implications and possible readings. The purposive seems to have the irrealis/modal and causal-logical relation most strongly as part of its meaning, rather than as an implicature.
Ch’ubmin
So the system of Ch’ubmin has:
Main clause:
Indicative (Past Perfective / Future / Imperfective)
Primarily dependent:
Consecutive (Perfective clause chaining form)
Subordinate~Participle (Prior / simultaneous / marginal posterior form)
Purpose
Lest
Conditional
Basically, the subordinate forms express complements and various forms of background adverbial clause, and maybe also relative clauses. Purpose clauses are mostly self explanatory but also serve as an imperative / hortative / optative and as complements in some cases. Lest clauses mark potential negative relative future outcomes of not acting. Conditional clauses mark protases.
This is a bit maximal compared to the previous systems. If I try to standardise the labels a bit, the others have the following approximate subordinate clause types:
GREENLANDIC: Prior~chaining, simultaneous~purpose, conditional, complement
YIDINY: Prior, simultaneous, posterior~purpose, lest
There are at least two interesting differences in the case of Ch’ubmin:
Unlike Greenlandic, it has separate forms for clause chaining (consecutive) and for backgrounded adverbials (the participle~subordinate forms)
Unlike Yidiny, it distinguishes purpose and other forms of posterior (clause chaining, participle)
The differences around the consecutive are related to the fact that Ch’ubmin is a VO language where the “medial” verbs follow the independent verb, whereas Greenlandic is an OV language with medial verbs typically preceding. Lots of people have observed that clause chaining is more common in OV languages and clause chains tend to be longer… and I guess it’s partly because in head-final languages, the independent verb at the end aligns with the culmination of the sentence.
If sentences tend to end on a high, then I think that having a form in an OV language which is ambiguous between a backgrounded prior adverbial clause (when, after, since) and a medial clause is more reasonable than having a form in a VO language which is ambiguous between a posterior, maybe backgrounded and maybe irrealis adverbial clause (purpose etc.) and a medial form. If a head-initial language has a medial or narrative form, it feels more necessary to split it from other kinds of adverbial. And it’s precisely in the posterior forms that there’s a lot of splits:
Of the subordinate forms, there are two primarily anterior ones (conditional and participle), one simultaneous one (participle), and four posterior (participle, consecutive, lest, purpose). The posterior ones differ in terms of background (participles are primarily off-timeline background information, the others are asserted), and reality status (consecutive forms are realis, purpose/lest are irrealis).
If I wanted to simplify this system of posterior forms further, I could:
- Not have a consecutive form (clause chaining is rarer in VO languages anyway)
- Not distinguish purpose (foregrounded, posterior, irrealis) from the somewhat marginal future participle/subordinate form (backgrounded, "about to")
- Not have a lest form
I'm not inclined to do the first, since the main reason to have a consecutive in a very prefix heavy language was to get a bit of variety in what the beginning of verbs looks like. I also quite like having lest, although there is also a frustrative~counterfactual clitic and purpose + frustrative feels like it could convey a lest type meaning.
The second is certainly possible... there is a dedicated affix for purpose, whereas the future participle is mostly a side effect of nu- combining with any indicative tense/aspect combination. I.e. one is monomorphemic and the other is just the compositional outcome of multiple morphemes. I'm not very attached to the future participle, it just feels like a cell that "should" be filled given the morphemes exist and aren't competing for the same slots. I get the impression that the Latin future participle could function both as an "about to" form and to express purpose.
Anyway, just musing on whether the current system feels economical enough or not.