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predicate nominative or subject complement

2 years ago

I am studying noun clauses (aka that-clauses aka nominal clauses) right now. I thought I've understood something. It appears I didn't.
Take a look at this sentence.
A new computer is what Matthew needs. [predicate nominative identifying the subject computer]

I thought that the noun clause in this sentence is a subject complement. I am confused.

Thank you for your explanation!