TEZPUR 2025 — English PYQ

To identify the error, we must examine the subject-verb agreement and the appropriate use of the noun "behaviour" in this context.

1. Identifying the grammatical mismatch:

• The sentence uses the plural noun "behaviours" combined with the singular auxiliary verb "has".

• In English grammar, "behaviour" is typically treated as an uncountable (mass) noun when referring to a general manner of acting. Therefore, the singular form "behaviour" should be used, requiring the singular verb "has."

• If we define the relationship between the subject $S$ (behaviour) and the verb $V$ (has changed), the condition for grammatical correctness is:

  $$S_{singular}⟹V_{singular}$$

  $$\text{Behaviour}⟹\text{has changed}$$

2. Error Analysis:

• The word "behaviours" is incorrectly pluralized in this specific context, and "has changed" is grammatically tied to a singular subject.

• Part (d), "behaviours has changed," contains the disagreement because "behaviours" (plural) does not agree with "has" (singular).

Conclusion:

The error lies in part (d). The sentence should be corrected to: "I was shocked to see how my brother's behaviour has changed."