Understanding Reported Speech Transformation

Reported speech (also known as indirect speech) is when we tell someone what another person said, but we do not use the person's exact words. We often need to change the tense of the verbs, the pronouns, and sometimes time and place references depending on when and where the reporting happens.

Transforming the Given Sentence to Reported Speech

The original sentence in direct speech is:

“I must stay with her as her condition is critical.”

The reporting verb is "He said," which is in the past tense. When the reporting verb is in the past tense, we usually make changes to the verbs and pronouns in the direct speech.

Key Changes Required:

• Pronoun: "I" refers to the speaker ("He"). So, "I" changes to "he".
• Modal Verb ("must"): When "must" expresses obligation, as it does here (an obligation to stay due to a critical condition), it is typically changed to "had to" in reported speech, especially if the obligation relates to a past situation. "Must" can sometimes remain "must" if it refers to a permanent rule or a very strong recommendation, but "had to" is the standard transformation for situational obligation when reporting in the past.
• Verb Tense ("is"): The verb "is" (present tense) describes the condition at the time the sentence was spoken. In reported speech with a past reporting verb, the present tense usually changes to the past tense. So, "is critical" changes to "was critical".

Applying the Changes Step-by-Step:

1. Start with the reporting phrase: "He said". Add "that" (optional): "He said that".
2. Change the pronoun "I": "He said that he".
3. Change "must stay": To show past obligation, change "must" to "had to". "He said that he had to stay".
4. Keep "with her" as it refers to someone else. "He said that he had to stay with her".
5. Connect the reason with "as". "He said that he had to stay with her as".
6. Change the tense of "is critical": Change "is" (present) to "was" (past). "He said that he had to stay with her as her condition was critical".

The resulting reported speech sentence is: "He said that he had to stay with her as her condition was critical."

Evaluating the Options

Let's look at the given options and compare them to our transformed sentence based on the rules of reported speech:

1. He said he would stay with her as her condition is critical.
   • "must" changed to "would": Incorrect transformation for obligation.
   • "is" remained "is": Incorrect tense change.
2. He said that he has to stay with her as her condition has been critical.
   • "must" changed to "has to": Incorrect tense (should be past, "had to").
   • "is critical" changed to "has been critical": Incorrect tense change.
3. He said that he had to stay with her as her condition was critical.
   • "He said that he": Correct pronoun and conjunction.
   • "must" changed to "had to": Correct transformation for past obligation.
   • "is critical" changed to "was critical": Correct tense change.

   This option correctly applies the rules for reported speech.

4. He said he must stay with her as her condition were critical.
   • "must" remained "must": Possible in some contexts, but "had to" is more common for specific past obligations.
   • "is critical" changed to "were critical": Incorrect tense/subject agreement ("condition" is singular, requires "was").

Based on the step-by-step transformation and analysis of the options, Option 3 is the correct reported speech version of the original sentence.

Revision Table: Reported Speech Key Changes

Additional Information on Reported Speech and 'Must'

The transformation of "must" in reported speech can be slightly flexible depending on the meaning of "must" in the direct speech:

• Obligation (as in this question): "must" usually becomes "had to" when the reporting verb is in the past. This indicates that the obligation existed at the time the original statement was made.
• Permanent Rule or Necessity: If "must" expresses a rule or a permanent necessity that is still valid at the time of reporting, it can sometimes remain "must" or be changed to "have to" (in the appropriate tense, like "had to" if reporting in the past) or "need to". For example, "You must wear a helmet" could be reported as "He said they must wear helmets" or "He said they had to wear helmets."
• Deduction/Certainty: If "must" is used to express a deduction (e.g., "He must be tired"), it is often reported using "must" + perfect infinitive ("must have been") or similar constructions to reflect the past certainty, or simply "must" if the deduction is still considered true. However, this use is less common for transformation rules compared to obligation.

In the context of the given sentence, "must" clearly implies an obligation due to the critical condition, making "had to" the most appropriate transformation in reported speech with a past reporting verb.