Letters that make progressive tense
s, o, e, g, n, p, r, t, i, v are letters that make 'progressive tense'
Words within progressive tense
RES, re, te, si, PR, en, SE, Ro, SI, SS, progressive, pro, iv, ten, tense, progress, IV, ogre, ogress, Re, Es, Pr, Se, Si, Te are words within 'progressive tense'