SSC CGL 2025 Tier-I · 23 September 2025, Shift 3 · English Comprehension · Question 19 of 100

We transcribed this text from the pictures on a candidate's response sheet for this shift; the answer is the key SSC colour-marked on that sheet. Solution last reviewed 13 September 2026.

Where this paper and its answers come from

SSC does not publish CGL question papers or a public answer key. From 2025 the candidate response sheet prints every question and option as a picture, so the text here is transcribed from those pictures for this shift and checked against them independently; where the layout carries meaning, the picture is shown as well. Each answer is the key SSC colour-marked on that sheet. SSC released a tentative key for challenge and later its final one, both only to candidates behind a login, and the sheet does not say which of the two it carries. The solutions are written by UnlockIAS.

Convert the sentence provided below from its passive voice structure to an active voice structure: The guests must have been informed about the delay by the coordinator.

(a)The coordinator might inform the guests about the delay.
(b)The coordinator had informed the guests about the delay.
(c)The coordinator must have informed the guests about the delay.
(d)The coordinator must be informing the guests about the delay.

Answer

Why

Correct — C. The passive verb is must have been informed: modal + have + been + past participle.

The agent after by, 'the coordinator', becomes the subject, and 'the guests' becomes the object.
The modal must and have stay; only been drops.

Result: 'The coordinator must have informed the guests about the delay.' → option (c).

Why the others are wrong

(a)
The coordinator might inform the guests about the delay. — Might inform changes what a voice change must keep: the modal (must → might, certainty → possibility) and the perfect (have informed → inform).
(b)
The coordinator had informed the guests about the delay. — Had informed drops the modal. The passive states a deduction, that the coordinator must have told them; past perfect states it as plain fact.
(d)
The coordinator must be informing the guests about the delay. — Must be informing is a deduction about an action in progress now. Its passive would be 'must be being informed', not the perfect 'must have been informed'.

Concept

Changing voice changes who stands where. The tense, the aspect and the modal stay as they are.

The agent after by moves to the front, the old subject moves after the verb, and the verb loses its be-form. With a modal perfect that gives a fixed pair: passive modal + have been + V3, active modal + have + V3.

Key facts

Passive modal perfect: modal + have been + V3 (must have been informed).
Active modal perfect: modal + have + V3 (must have informed).
Must have + V3 expresses a confident deduction about the past.
The modal carries over unchanged between voices: must stays must.

Study next

Voice change with the future perfect: will have been delivered → will have deliveredPassive of continuous forms: must be being informedPast deduction with must have, might have and can't have + V3

Common traps

Dropping have along with been, which turns the past deduction must have informed into a present must inform.
Swapping the modal for a near neighbour such as might or should while changing the voice.

13 Sep 2025, 16:00, English Q.14 tests the same step with a future perfect: 'The package will have been delivered by the courier' becomes 'The courier will have delivered the package'.

9 Sep 2024, 12:30, English Q.1 keeps the modal the same way: 'The homework must be done by you' → 'You must do the homework'.

Related PYQs

No directly related past PYQ was found.

Topic: Active and passive voice — all 132 SSC CGL questions on it, every solved shift.