A dog runs in a grassy field .
It is probably the case that the grass in the field is so high that it is difficut to see the dog running through the field .
It is highly unlikely that the grass in the field is so high that it is difficut to see the dog running through the field .
It is probably the case that the grass in the field is so high that it is difficut to see the dog running through the field .
The grass in the field is so high that it is difficut to see the dog running through the field .