• “Khalid” points to one named person: Khas.
• “5 books” gives a fixed quantity: Khas.
• “Every student present today” includes all students within the stated class: Aam.
Both Khas and Aam may involve several people or things. The question is whether the wording gives a defined or limited subject, or reaches every member of a named class.
This comparison identifies scope; it does not yet state the detailed legal consequence.