"It does not rot"
-i suffix indicates present tense negation. Therefore the entire verb prefix indicates the noun class(es) that could be creating this compound. 'Hali' is a Ji/Ma noun subject concord.
But, without an actual clue to which Noun this is connected to, I don't know how you would GUESS this solution.
this is one of those irritating words they give out of context when they know very well verbs have syllables that indicate noun classes. In this case, it's indicating that the subject noun being referred to is in the noun class 'Li/Ya' hence why the syllable '-li-' is used.
'It didn't rot' would be 'Halikuoza', again if the noun class is 'Li/Ya'. Usually verbs in the affirmative use the past tense syllable '-li-' while those in the negative use the syllable '-ku-' coupled with the prefix 'ha-'. e.g.
For this lesson introductory notes would be very beneficial, at least for me. I really miss the basic grammar rules here and it is not clear for me where look for them in other sources.
Maybe, I this can be done, some additional context words in the exercises would help as well get some more feeling for this topic.