s, e, f, n, p, c, r, t, i, v are letters that make 'perfective tense'
ER, RF, pe, ti, te, EC, en, perfective, SE, perfect, iv, ten, tense, ECT, CT, IV, Er, Fe, Rf, Se, Te, Ti are words within 'perfective tense'
1 possible definitions for 'perfective tense'
Under this definition, perfective tense is a noun and has the following properties:
perfective, perfect, perfect tense have the same meaning as 'perfective tense'
'perfective tense' can be a type of tense.
past perfect, future perfect tense, present perfect, present perfect tense, past perfect tense, pluperfect tense, future perfect, pluperfect are types of 'perfective tense'.