A surfer with a large white surfboard and tether line is standing on the beach on an overcast day .
It is probably not the case that a surfer contemplates whether or not to surf on a cloudy day .
It is highly likely that a surfer contemplates whether or not to surf on a cloudy day .
It is probably not the case that a surfer contemplates whether or not to surf on a cloudy day .
A surfer contemplates whether or not to surf on a cloudy day .