predicate nominative or subject complement

5 years ago

Hi!

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!