c12c7ff0_Forms___Luke_s_ENGLISH_Podcast__Example
[#] 3 [Tense] Past perfect [Why is the passive used?] Actually, it is impossible to put this sentence in an active form. To be due to do something is just a fixed passive expression [Example] 
Jackson had been due to perform a series of comeback concerts
19. Passive Verb Forms | Luke’s ENGLISH Podcast
Example