Tertius Robertus wrote:i have another question on mi verbs. because we are given another chart to memorize, which is the perfect system of ιστημι, but it is not told whther the chart works for all the mi verbs with the combination (h a) of verb stems..
ἵστημι must be taken on its own terms — it's a very odd verb.
I'm not a big fan of the phrase "μι-verbs." There is no such thing as a μι-verb, there are only verbs which have μι
presents. It is true that some of the most common μι-present verbs are odd in several of the principal parts, but that's not intrinsic to their taking μι-presents. βαίνω is a perfectly normal present stem but has a root-aorist, ἔβην, which acts like the 2nd aorist of ἵστημι, ἔστην, whereas δείκνυμι has a boring, regular aorist, ἔδειξα.
Each principal part of a verb may have its own character which will not necessarily be predictable from other principal parts.