The Klingon dictionary is clear that numbers "may stand alone as subjects or objects or they may modify another noun." It is an easy logical leap to treat {'ar} in the same way, but {'ar} is not a type of number and so that may not be allowed.  TKD says only that {'ar} "follows the noun to which it refers." Does anyone know if any canon which uses {'ar} as a stand alone subject or object? What do you think of that use of it and particularly if teaching that use of it?

The sentence that raised this question, by the way, is 'ar bo'ab, meant to mean How tall are you?

I would point out that only 'Iv and nuq (and, by extension of suffix, nuqDaq) act like pronouns, substituting for the answer. 'ar does not substitute itself for a number. This is clear not only because 'ar comes after the noun, not before, and constrains its use of a plural suffix, but because 'ar can be used on mass nouns where numbers cannot. You can ask nIn 'ar wIghaj How much fuel do we have? but you cannot say vagh nIn wIghaj We have five fuels.

-- 
SuStel
http://trimboli.name