A fire engine sits near a cloud of thick smoke with one fireman on top of the truck and another fireman walking towards the smoke .
It is probably not the case that the two firemen are heading to put the fire out .
It is highly likely that the two firemen are heading to put the fire out .
It is probably not the case that the two firemen are heading to put the fire out .
The two firemen are heading to put the fire out .