Letters that make future perfect tense
s, e, f, n, p, c, r, t, u are letters that make 'future perfect tense'
Words within future perfect tense
ER, RF, pe, re, te, EC, en, perfect tense, future perfect, SE, ut, Utu, perfect, future, ten, tense, ECT, CT, Ur, Re, Er, Fe, Rf, Se, Te, UT are words within 'future perfect tense'