Only the first sentence with was is grammatical. CB
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Selvakumar What I wanted to know was about the requirements in the examination."What I wanted to know" is a noun phrase and the subject of the sentence; "was" is a predicator (a linking verb) there; "about the requirements in the examination" a complement (of "to know"). There is "was" instead of "were", here, because of the fused relative pronoun "What" whic