Police officers on motorcycles stopped in front of a building .
There are motorcycles in front of a building .
Police officers on motorcycles stopped in front of a building.
There are motorcycles in front of a building.
'There are motorcycles in front of a building' is a rephrasing of 'motorcycles stopped in front of a building'.
'There are motorcycles in front of a building ' is a rephrasing of 'motorcycles stopped in front of a building ' .