A large group of people waiting at a train station .
It is almost certain that a group of schoolchildren going on a fieldtrip are waiting to board a train .
There is almost no chance that a group of schoolchildren going on a fieldtrip are waiting to board a train .
It is almost certain that a group of schoolchildren going on a fieldtrip are waiting to board a train .
A group of schoolchildren going on a fieldtrip are waiting to board a train .