Don`t you know who it is? "
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Don`t you know who it is? Or if someone is knocking on your door you might ask: "who is it?"
Iron ManDon't you know who it is?
Or
Don't you know who is it?
A direct question always occurs alone, as a main clause.
Who is it?
An indirect question is embedded within a larger clause.
... who it is.
Certain verbs and expressions can take indirect questions as complements. Some examples are not