When people say “they're engaged,” the phrase “to be married” 'is understood'. [=“they're engaged” is understood to mean “they're engaged to be married”]
We still don't fully 'understand' the causes of the disease. = The causes of the disease are still not fully 'understood'.
He believed it 'was understood' [=believed that everyone had agreed] that he would be paid for the work.
(..) Do not worry if we are close enough find us. Sure, My Lord will be all right. What do you do when this is over, is Brutus? I have not quite understood the question When everyone is defeated... ... together Shoukata when the search is over I'm not sure That's never happened so far.. (..)2011 The Dragon Warrior