s, a, o, e, g, p, r, t, i, v are letters that make 'past progressive'
PA, RES, re, si, PR, Pa, Ro, SI, SS, progressive, past, pro, iv, as, progress, pas, IV, AS, ogre, ogress, Re, pa, As, Es, Pr, Si are words within 'past progressive'
1 possible definitions for 'past progressive'
Under this definition, past progressive is a noun and has the following properties:
past progressive tense has the same meaning as past progressive
'past progressive' can be a type of progressive tense, imperfect tense, continuous tense, imperfect, progressive.
"`I had been running' is an example of the past progressive"