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Help the frantic lawyer read the eccentric billionaire's will. Select ALL the options that grammatically complete the sentence using formal standard English.
The late Mr. Moneybags explicitly demands that his pet iguana, Mr. Scales, _____ alone in the mansion under any circumstances.
The correct answers are not be left and should not be left.
In formal English, verbs like demand, insist, and recommend trigger the mandative subjunctive in the following that-clause.
To form the negative passive subjunctive, we simply use not + be + past participle (e.g., not be left). We do not use "do/does" as an auxiliary verb in the subjunctive mood.
Using should + base verb (e.g., should not be left) is also perfectly correct and is especially common in British English as an alternative to the pure subjunctive.