Me and my friend had a minor disagreement over this sentence:

"Every teacher and student (know/knows) that exams are always unfair to some."

Is "Every teacher and student" singular or plural? Is it know or knows?


Singular. When you say "every" or "each" in this context you are singling out members of a group (in this case, your "teacher" and "student" implicit group), and saying that they all have a property.

You may have heard more singular use with the word "each" such as:

Each student and teacher knows that exams are...

Of course, you can swap it out for "all" and change the members to plurals:

All students and teachers know that exams are...
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