[tlhIngan Hol] Moods and modality

[SuStel]

Various sources I've read (e.g., the Wikipedia entry on Klingon) say 
that Klingon has two moods: indicative and imperative. Maybe this is 
right. But what determines whether something is a mood? Does Klingon 
have an interrogative mood (*bItlhutlhtaH'a'*/Are you drinking?/)? What 
about an optative mood (*bIQuchjaj*/May you be happy/)? We know that we 
can create an irrealis with *net jalchugh; *is this a subjunctive mood? 
Or does a mood require an inflected verb? Do the qualification suffixes 
create a mood?

Basically, how does one determine what moods a language actually has, 
and can we apply this to Klingon?

-- 
SuStel
http://trimboli.name

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