Some verse endings exhibit a prolonged sound through long vowels. A suitable final ā, ū, or ī can lend ease to the close of a clause. The same exact letter or lexical ending need not occur in every adjacent verse.
Endings of the sort heard in ʿalīmūn and muʾminūn illustrate how different meanings can nevertheless share a recognizable final cadence. The words need not be identical for the auditory relationship to be noticeable.
Caution: this discussion concerns rhetoric and verse-end sound. It does not attempt to establish a complete rule about tajwīd or one uniform duration of vowel extension in every context.