[tlhIngan Hol] adjectives bearing the {-be'}

I know that we aren't supposed to write "I read (whatever) at boQwI'", but I have to write it, because there I read that.. "the {-be'} can be applied to verbs used as adjectives". However, I have trouble understanding the meaning that the "noun-be verb-{-be'}" would then have. If I write {veng tInqu'Daq} then obviously this means "at the very big city". But if I write {veng tInbe'Daq}, then what would this mean ? "at the not big city" ? or maybe "at the city which isn't big ?". qunnoq