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Suppose someone is knocking on my door,
My mom ask me: Who is it?
Me: That'll be Rihanna. / That would be Rihanna. / That should be Rihanna. / That is Rihanna.
Which is most certain, and which is least?
Me: That'll be Rihanna. / That would be Rihanna. / That should be Rihanna.
