Some parts of the sentence have an error and some parts are correct. Find out which part of the sentence has an error. If a sentence is free from error, choose 'No error' as the answer.
(a)
Understanding Grammar Errors in Sentences
Let's carefully examine the given sentence to find the part that contains a grammatical error. The sentence is broken down into three parts, (a), (b), and (c), followed by option (d) for 'No error'.
The sentence states:
- (a) Early cities rely on food and water
- (b) from the surrounding countryside,
- (c) but today cities often depend on distant sources.
- (d) No error
Analyzing Each Part for Errors
We will look at each segment to check for correctness in grammar, tense, and structure.
- Part (a): Early cities rely on food and water
This part talks about "Early cities". The term "Early cities" refers to cities in the past. When discussing actions or states that were true for past entities or periods, we typically use the past tense of the verb. The verb used here is "rely," which is in the present tense. This creates a mismatch between the subject ("Early cities" - past) and the verb ("rely" - present).
- Part (b): from the surrounding countryside,
This phrase acts as a prepositional phrase modifying the source of food and water. It grammatically connects to where the food and water came from. In the context of early cities depending on nearby areas, this part is grammatically correct and makes sense.
- Part (c): but today cities often depend on distant sources.
This part discusses "today cities," referring to modern cities. The verb used is "depend," which is in the present tense. This is appropriate because it describes a general truth or habitual action in the present time ("today"). The contrast introduced by "but" is also correctly used to show the difference between early cities and today's cities.
Identifying the Specific Error
Based on the analysis, the error lies in Part (a). The subject "Early cities" requires a verb in the past tense to be consistent with the historical context implied by "Early". The present tense verb "rely" should be the past tense verb "relied".
The corrected sentence part would be: "Early cities relied on food and water".
The corrected full sentence would be:
Early cities relied on food and water from the surrounding countryside, but today cities often depend on distant sources.
Summary of Analysis
| Part | Text | Analysis | Error Status |
|---|---|---|---|
| (a) | Early cities rely on food and water | Subject ("Early cities" - past) needs past tense verb. "rely" is present tense. | Error |
| (b) | from the surrounding countryside, | Correct prepositional phrase modifying source. | Correct |
| (c) | but today cities often depend on distant sources. | Subject ("today cities" - present) uses present tense verb "depend". Correct contrast. | Correct |
Therefore, the part of the sentence that has an error is (a).
Revision Table: Key Grammar Concepts
| Concept | Explanation | Example |
|---|---|---|
| Subject-Verb Agreement | The verb must agree in number and tense with its subject. | He walks (present singular). They walk (present plural). He walked (past singular/plural). |
| Verb Tense Consistency | Maintain consistent tense when describing events happening at the same time, unless there's a specific reason to shift (e.g., discussing a past event followed by a present fact). | Incorrect: She walks to the store and bought milk. Correct: She walked to the store and bought milk. |
| Simple Past Tense | Used for actions completed in the past. Often indicated by time expressions referring to the past (like "Early times", specific dates). The verb form is usually '-ed' or an irregular form. | Early humans lived in caves. They ate wild berries. |
Additional Information on Verb Tenses
Understanding verb tenses is crucial for constructing grammatically correct sentences. The simple past tense is used to talk about events that happened and finished before the present time.
For example, if we are discussing historical facts or past states, we use the simple past tense. In the given sentence, "Early cities" clearly indicates a time in the past, so the verb describing their action or state at that time must be in the past tense.
Let's consider the structure of the sentence again:
[Past subject/time period] [Past tense verb] ... but [Present subject/time period] [Present tense verb] ...
This structure correctly contrasts a past situation with a present one, provided the verb tenses match the respective time frames.
In our case, "Early cities" is the past subject, requiring a past tense verb like "relied". "Today cities" is the present subject, correctly matched with the present tense verb "depend".
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