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Question

Identify the part of the sentence that contains a grammatical error.

A. My grandfather B. is not only C. a fastly runner, D. but also a great swimmer.

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

a fastly runner,

The task is to find the segment that carries a grammatical mistake in the given sentence.

The sentence uses the correlative pair 'not only ... but also', which links two comparable descriptions of the grandfather.

The error lies in the segment 'a fastly runner'. The word 'fastly' does not exist in standard English.

'Fast' is one of those words whose adjective and adverb forms are identical; we say 'a fast runner', never 'a fastly runner'.

Adding the suffix '-ly' here is wrong because 'runner' is a noun and needs the adjective 'fast', not an adverb form.

So the corrected phrase should read 'a fast runner', keeping the parallel structure with 'a great swimmer'.

The other parts are grammatically sound: 'My grandfather', 'is not only' and 'but also a great swimmer' are all correct.

Hence the part containing the error is a fastly runner,.

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