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Question

Choose the most suitable option to replace the highlighted part of the sentence:

One should do ones' duty.

This question was previously asked in
SSC CHSL 2025 Tier 1 Question Paper (21-Nov-2025) (Shift 1)
The correct answer is

One should do one’s duty

This question tests the correct possessive form of the indefinite pronoun 'one' and its agreement within the sentence.

The indefinite pronoun 'one' forms its possessive as 'one’s', with an apostrophe before the letter s, exactly like a singular possessive noun.

The highlighted phrase 'do ones' duty' is wrong because 'ones'' (apostrophe after the s) is a plural possessive, which does not apply to the singular pronoun 'one'.

The subject of the sentence is 'one', so any pronoun referring back to it must also be 'one' or 'one’s', keeping the reference consistent.

Option 1, 'One should do one’s duty', supplies the correct singular possessive 'one’s' and keeps the noun 'duty' singular, so it is grammatically accurate.

Option 2, 'do ones duties', drops the apostrophe altogether and needlessly pluralises 'duty', so it is incorrect.

Option 3, 'do once duties', replaces the pronoun with the adverb 'once', which changes the meaning and is ungrammatical.

Option 4, 'do their duty', breaks pronoun agreement by pairing the singular 'one' with the plural 'their'.

The correct replacement is One should do one’s duty.

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