What I was taught was that ‘ana nominalizes something that is already a verb and turns it into a noun.
Hele can be turned into hele ‘ana for "the going."
If added to hīmeni it becomes singing as a noun but is redundant when hīmeni is already both a noun for singing and a verb for singing.
As far as I know, ‘ana is not added to create verbs or act as present participle. (These are not the same kind of "ing")
Yes! ‘ana is added to verbs for this (though the other person was stating for it to be added to nouns to create a verb).
Hīmeni, however, is one of those words thats already used for both the noun form and the verb form. It is classified as "nvt" which indicates noun + transitive verb. :)