Several boys in bright orange clothing standing in front of a lake with boats in it , holding up an object that is dripping .
It is certain that a group of schoolboys are playing with a toy boat near the water .
It is probably not the case that a group of schoolboys are playing with a toy boat near the water .
It is certain that a group of schoolboys are playing with a toy boat near the water .
A group of schoolboys are playing with a toy boat near the water .