aspect and mood in the future

[Sergey Lyosov]

Dear all,
could you please help me with literature references?
Working on a description of the Akkadian morphosyntax, I have had an opportunity to observe:
“cross-linguistically, in the future-time domain verb forms more often than not do not have morphological means to oppose aspectual and modal senses, due to the non-real ontological status of the future.”
It seems to me a commonplace, but is it? Are there typological reference works corroborating this claim?
Thank you very much,
Sergey

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