(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “s- + pokopić, from po- + kopić?”)
1) Personal neuter forms might be considered nonstandard, protological, or nonce, appearing mostly in literature to refer to grammatically neuter nouns, however might also be used for people who prefer neuter forms. 2) The pluperfect is either archaic or obsolete and now used for conditional in the past.