What the man did was not very polite.


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I'd say that the single word subject of the sentence is 'What'. It is part of a dependent clause, 'What the man did'. From that, we understand that 'What' refers to the man's behaviour on this occasion.

Or some might say that 'What the man did' is a noun phrase and, as a whole, it forms the subject of the sentence.

Either way, the verb 'was' relates to the man's behaviour: that is what was not very polite.

Hope this helps


Very Good explanation!Thanks very much!