All that Tolkien indicated concerning continuative-past is that it exists but did not elaborate further [1]. Consequently this is entirely speculative, mostly done to make it easier to learn as well as prevent endless variations.
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Add mî beforehand, A-fortify the base vowel[2], suffix -i. |
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Add mî beforehand, Change variable vowel to -u, suffix -i. |
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Add mî beforehand, Break up consonant clusters with additional base vowels, A-fortify last main vowel, replace final -â with -i. |
*azgarâ- “to wage war” > azagâri “was waging war” | abrazâ- “to endure” > abarâzi “was enduring” |
[1]. Scholars have speculated that there is one example of continuative-past tense involving the derived verb azgarâ, (azaggara), but it is entirely speculative with no useful pattern, so it will be ignored for the sake of Neo-Adûnaic.
[2]. Alternatively, lengthen the base vowel. At present, there is no clear consensus on which Tolkien would have preferred, a-fortification or vowel-lengthening with continuative biconsonantal verb form.