Identifying Grammatical Errors in English Sentences

The question asks us to find the segment in the given sentence that contains a grammatical error. The sentence is: "The soldiers had no choice when to obey the commander."

Analyzing the Sentence Structure

Let's break down the sentence parts provided in the options:

• The soldiers: This is the subject of the sentence. It is grammatically correct as the subject of a plural verb or verb phrase like "had".
• had no choice: This is a common English phrase meaning there were no alternatives available. It is grammatically correct on its own.
• when to obey: This phrase follows "had no choice". Let's examine if this is the correct structure.
• the commander: This is the object of the verb "obey". It is grammatically correct.

Identifying the Grammatical Error

The core of the issue lies in the phrase "had no choice when to obey". When the phrase "had no choice" is followed by an infinitive verb (like "to obey"), the standard and grammatically correct construction is "had no choice but to + base form of the verb".

The word "when" is used to introduce clauses or phrases related to time, or in question forms. In the context of "had no choice", it doesn't fit grammatically or logically. The sentence implies that the soldiers had only one option regarding obeying the commander, not that they had no options regarding the timing of their obedience.

The correct structure should be:

The soldiers had no choice but to obey the commander.

This means their only option was to obey.

Evaluating the Options

Based on our analysis, the segment containing the grammatical error is "when to obey". Let's match this with the given options:

• Option 1: <p>when to obey</p> - This matches the incorrect segment.
• Option 2: <p>had no choice</p> - This phrase itself is grammatically correct.
• Option 3: <p>The soldiers</p> - This subject phrase is grammatically correct.
• Option 4: <p>the commander</p> - This object phrase is grammatically correct.

Therefore, the segment with the grammatical error is "when to obey".

The final answer is when to obey.

Revision Table: Understanding "No Choice But To"

Additional Information: Similar Structures

While "no choice but to" is the standard structure when an infinitive follows "no choice", other structures exist when "choice" is followed by prepositions like "of" or conjunctions like "whether".

• No choice of: Often followed by a noun or gerund (though less common than "but to"). Example: "There was no choice of dessert." or "They had no choice of resisting." (less common, "but to resist" is preferred).
• No choice but: Can sometimes be followed by a noun phrase when it means "nothing other than". Example: "It was no choice but destiny." (This usage is different from "no choice but to + verb").
• No choice but that: An older or less common structure, sometimes followed by a clause. Example: "He had no choice but that he must agree." (Modern English prefers "but to agree").

In the context of performing an action (like obeying), "no choice but to + infinitive" is the correct and expected grammatical form.