Recently I've read a passage that seems to me is a passive without 'to be'.
Example:
The new bank will speed the acquisition of the materials needed for rebuilding the town.
Shouldn't the word needed have to be accompanied by a 'to be' element to make it a passive voice?
like this:
the new bank will speed the acquisition of the materials that are needed for rebuilding the town.
or is it a completely different grammar rule?
