There's really no sure way to know.
I don't know, but my Dad said it was a mistake.
What is the likelihood it will be a hairtest
One, but it will take 13 attempts.
Let's go fishing
Two, two... One, two.
Just one, but they get extra credits for it
Someone who stays up at night wondering if there really is a dog.
Someone who stays up all night wondering whether or not there is dog.