Select the correct indirect form of the given sentence.
The supervisor said to the staff, "Make sure that every room is disinfected properly."

Correct option is D

The correct indirect speech is (d) The supervisor instructed the staff to make sure that every room was disinfected properly.
Definitions:
· Direct Speech: Reporting the exact words spoken (e.g., "Make sure...")
· Indirect Speech: Reporting the essence of what was said without quoting the speaker exactly.
Rules of Conversion:
1. Said to → becomes instructed/ordered/told (in case of commands).
2. Imperative sentences (like “Make sure…”) are converted into to-infinitive form: to make sure...
3. Since the reporting verb “said” is in past tense, the tense of the subordinate clause must also change accordingly:
· Present simple → Past simple
Direct: "Make sure that every room is disinfected properly."
Indirect: to make sure that every room was disinfected properly.
Why Other Options Are Incorrect:
· (a) "had been disinfected" – Incorrect past perfect tense.
· (b) "was being disinfected" – Continuous tense is not applicable.
· (c) Uses "instructs" (present tense), while the reporting verb is in past tense.
Final Indirect Sentence:
The supervisor instructed the staff to make sure that every room was disinfected properly.
This version preserves the intent and structure of the original while following proper conversion rules.