Zacharov said that the Manchurian verbal ending-mbihe was derived from the connection of two elements: Converbme and bihe, perfect-participle form of an aux. verb bi (Grammatika Manczurskago Jazyka §145)
From hence, however, we cannot fully explain all of its functions and meanings.
Using a number of texts the author has generalized the followings:
I. A) As the Predicate of Independent C1.…Durative.
B) Preceded by Conditional C1…Subjunctive.
II. Followed by the Particle de…Conditival.
Concerning the origin of this ending another explanation is to be seen here. That is to say, mbihe was derived from the aggultination he to mbi.