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Help the detective complete her rather theatrical report on the museum heist by choosing the correct inverted conditional forms.
______________________________________, the sleeping guard would never have noticed him tiptoeing past the dinosaur exhibit. Furthermore, __________________________________ a bit more modern, the museum wouldn't even need to hire human guards in the first place!
Had the burglar not sneezed
This is an inverted third conditional (past unreal). It means "If the burglar had not sneezed." We drop "if" and put the auxiliary verb "had" before the subject. "Did" and "has" cannot be used to form this conditional.
were the alarm system
This is an inverted second conditional (present/future unreal). It means "If the alarm system were..." In formal English, we use "were" (not "was") for all subjects when inverting a second conditional.