Have I spoken (λελαληκα). Perfect active indicative of λαλεω, for permanent keeping (τηρεω verse John 14:23).

While yet abiding with you (παρ' υμιν μενων). Present active participle, no "yet" (ετ) in the Greek, "while remaining beside (παρ') you" before departing for the coming of the other Paraclete.