Q
Medium 1 Mark
English Subject-Verb Agreement
She is the only teacher who _____ every single student in the school by name.
Explanation
The antecedent here is 'the only teacher' (singular), so the relative clause verb is singular: 'knows'.
Reference: Skoolyst English Grammar Series , Page 1
Hint
The word 'only' signals that the antecedent refers to just one person.
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