«كل إنسان حيوان»
Every human is an animal.
“Human” is the subject, “animal” the predicate, and “every” marks affirmation across all subject instances. The proposition is therefore a universal affirmative.
Another example is “Every square is a four-sided figure.” The predicate is asserted of each square.
The word “every” does not simply imply a large number; it says the judgment applies without excluding any instance of the subject.