Hi.
It's such a hot day that I must go to the beach.
What's the form of the underlined part?
What's the function of the boldfaced part?
Persian Learner It's such a hot day that I must go to the beach. 'such a hot day' (and all that follows, actually) is a noun phrase. It's a subject complement.
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Persian LearnerIt's such a hot day that I must go to the beach.
'such a hot day' (and all that follows, actually) is a noun phrase. It's a subject complement. ('it' is the subject.)
The whole phrase (to the end of the sentence) might be called an equative correlative construction (if you like terminology