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"All visitors to the factory" is the complete subject.
The complete subject of the sentence is "All visitors to your school." It includes the determiner "all," the noun "visitors," and the prepositional phrase "to your school."
all visitors to our school
All visitors to your school
must report at the office
must report at the office
must report at the office
must report at the office
must report at the office
must report at the office
Complete Predicate: must report at the office Complete Subject: All visitors to our school
"must report at the office" is the complete predicate of the sentence. It includes the main verb "report" and the prepositional phrase "at the office."