Understanding Grammatical Errors in English Sentences

The question asks us to find the segment with a grammatical error in the sentence: "Fortunately, / the fire did not / caused much damage / to the building." We need to examine each segment carefully based on standard English grammar rules.

Analyzing Each Sentence Segment

Let's break down the sentence into its four parts and check the grammar of each part:

1. "Fortunately,": This segment is an adverb used to modify the entire sentence. It is correctly placed and punctuated with a comma. This segment is grammatically correct.
2. "the fire did not": This segment contains the subject ("the fire") and the auxiliary verb phrase ("did not"). This structure is correct for forming a negative sentence in the past tense. The error, if any, would typically follow this phrase in the main verb. This segment itself is grammatically correct.
3. "caused much damage": This segment contains the main verb ("caused") and the object ("much damage"). However, when the auxiliary verb "did not" is used in a negative sentence, the main verb that follows it must be in its base form (the infinitive without 'to'). The base form of the verb "caused" is "cause". Using "caused" (the past tense form) after "did not" is a common grammatical error. This segment contains a grammatical error.
4. "to the building": This segment is a prepositional phrase indicating the recipient of the damage. It correctly follows the structure of the sentence. This segment is grammatically correct.

Identifying the Grammatical Error

Based on the analysis, the error lies in the third segment, "caused much damage". The verb "caused" should be in its base form "cause" because it is used with the auxiliary "did not". The correct sentence segment should be "cause much damage".

The correct sentence would be: "Fortunately, the fire did not cause much damage to the building."

Why "did not" requires the Base Form

In English, when we use auxiliary verbs like 'do', 'does', or 'did' (especially in negative sentences with 'not' or in questions), the main verb that follows must always be in its base form. This is a fundamental rule for forming negative statements and questions in simple present and simple past tenses.

• Correct: Subject + did not + base form of verb + ... (Simple Past Negative)
• Incorrect: Subject + did not + past tense form of verb + ...
• Incorrect: Subject + did not + -ing form of verb + ...

Conclusion on the Grammatical Error

The segment "caused much damage" contains the grammatical error because the verb "caused" should be in its base form "cause" after the auxiliary "did not".

Revision Table: Rules with 'Did Not'

Additional Information: Auxiliary Verbs and Main Verbs

Auxiliary verbs (also called helping verbs) are used with a main verb to express tense, mood, or voice. 'Do', 'does', and 'did' are forms of the auxiliary verb 'do'.

• In simple present tense questions and negatives, we use 'do' or 'does' followed by the base form of the main verb.
• In simple past tense questions and negatives, we use 'did' followed by the base form of the main verb.

Example:

• Present Positive: She reads books.
• Present Negative: She does not read books.
• Present Question: Does she read books?
• Past Positive: He wrote a letter.
• Past Negative: He did not write a letter.
• Past Question: Did he write a letter?

Understanding this rule is crucial for correctly forming negative sentences and questions in simple past tense.