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What I'm unsure about is how often it happens.

Is What I'm unsure about a noun phrase and a subject? And if so, is What a fused head of that NP? Is What also the understood complement of the preposition about?

Is the interrogative subordinate clause how often it happens a predicate complement subject-oriented?

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anonymous

What I'm unsure about is how often it happens.

Is What I'm unsure about a noun phrase and a subject? Yes. And if so, is What a fused head of that NP? Yes. Is What also the understood complement of the preposition about? Yes.

Is the interrogative subordinate clause how often it happens a predicate complement subject-oriented? Yes.

CJ