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Sorry to ask such an obvious question, but this escapes me.

Wheelock's Chapter 32 SA #4: Plus novisti quid faciendum sit. What use of the subjunctive might this be with the future passive participle. Is this a subjunctive passive periphrastic construction? thanks.

quid faciendum sit -- this is subjunctive because it's an indirect question. It's what Allen & Greenough call the "second periphrastic conjugation"--a form of esse + gerundive (or "future passive participle"; here neuter because impersonal), implying obligation or necessity.

http://www.perseus.tufts.edu/hopper/tex ... ythp%3D194

http://www.perseus.tufts.edu/hopper/tex ... ythp%3D196