In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select 'no improvement'. The diesel engines replaced the steam engines and the old first class coaches (is replaced) by coupes in a corridor.
Were replaced
Let's analyze the given sentence and the bracketed part that needs potential improvement.
The sentence is: "The diesel engines replaced the steam engines and the old first class coaches (is replaced) by coupes in a corridor."
The part in brackets is (is replaced).
Understanding the Sentence Structure and Grammar
We need to look at the subject associated with the verb in the bracketed part and the overall tense of the sentence.
- The sentence discusses events that happened in the past ("replaced").
- The bracketed part describes what happened to "the old first class coaches".
- The subject is "the old first class coaches". The noun "coaches" is plural.
- The action is being performed on the coaches (they are replaced by coupes), indicating a passive voice construction.
Analyzing the Bracketed Part "(is replaced)"
- "is" is a form of the verb 'to be' used with singular subjects in the present tense.
- "replaced" is the past participle of the verb 'replace'.
- "is replaced" is the present passive form, typically used for singular subjects.
However, our subject "coaches" is plural, and the sentence describes past events. Therefore, "is replaced" is incorrect in terms of both subject-verb agreement (singular 'is' with plural 'coaches') and tense (present 'is' in a past context).
Selecting the Correct Verb Form for Sentence Improvement
We need a verb form that agrees with a plural subject ("coaches"), is in the past tense, and is in the passive voice (auxiliary verb 'to be' + past participle 'replaced'). The plural past form of 'to be' is "were".
So, the correct form for the passive voice in the past tense with a plural subject is "were replaced".
Evaluating the Options
Let's examine the given options:
| Option | Verb Form | Analysis |
|---|---|---|
| 1 | Was replaced | "Was" is singular past. Subject "coaches" is plural. Incorrect subject-verb agreement. |
| 2 | Were replaced | "Were" is plural past. Subject "coaches" is plural. "Were replaced" is plural past passive. Correct subject-verb agreement and tense. |
| 3 | Were replace | "Were" is plural past, but "replace" is the base form. Passive voice requires the past participle ("replaced"). Incorrect verb form. |
| 4 | No improvement | "Is replaced" is singular present passive. Subject "coaches" is plural and sentence is in past tense. Improvement is needed. |
Based on the analysis, "Were replaced" is the correct verb form that fits the plural subject ("coaches"), the past tense context, and the passive voice requirement.
The improved sentence reads: "The diesel engines replaced the steam engines and the old first class coaches were replaced by coupes in a corridor."
Conclusion
The bracketed part "(is replaced)" needs to be improved to correctly reflect the plural subject and the past tense of the sentence in the passive voice. The correct form is "Were replaced".
Revision Table: Key Grammar Concepts
| Concept | Explanation | Example |
|---|---|---|
| Subject-Verb Agreement | The verb must agree in number (singular/plural) with its subject. | A coach was replaced. Coaches were replaced. |
| Verb Tense | Indicates when an action happened (present, past, future). Sentence context helps determine tense. | They replaced engines (past). Coaches are replaced (present passive). Coaches were replaced (past passive). |
| Passive Voice | The subject receives the action (e.g., "The coaches were replaced"). Formed with a form of 'be' + past participle. | Active: Coupes replaced the coaches. Passive: The coaches were replaced by coupes. |
Additional Information: Using Passive Voice
The passive voice is often used when the action is more important than the doer, or when the doer is unknown or obvious. In this sentence, the focus is on what happened to the coaches, so the passive voice is appropriate.
The structure of the passive voice is:
Subject + form of 'be' + past participle of the main verb + (optional: by + agent)
For past passive with a plural subject, the form of 'be' is "were".
Subject: the old first class coaches (plural)
Form of 'be' (past, plural): were
Past participle of 'replace': replaced
Agent: by coupes
Putting it together: The old first class coaches were replaced by coupes.
Important Questions from Phrase Replacement
Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select No improvement.
The questions are so simple that a child can understand it .
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