Find the Error :- My friend did not see me (1)/for many years(2)/when I met him last week.(3)/ No error(4)

Explanation

To find the error in the given sentence, we will analyze each part step by step.

1. **Identify the Structure**: The sentence consists of two parts: "My friend did not see me for many years" and "when I met him last week." The first part describes an action that took place over a duration in the past, while the second part describes a specific point in time in the past.

2. **Understanding Tenses**: The first part of the sentence uses the simple past tense ("did not see"), which is appropriate for a completed action. However, since it refers to a duration of time ("for many years"), it should ideally use the past perfect tense to indicate that this action was ongoing until a specific point in the past.

3. **Correcting the Error**: To correct the error, we need to change "did not see" to "had not seen." This change reflects that the action of not seeing continued up until the moment of meeting last week.

4. **Revised Sentence**: The corrected sentence should read: "My friend had not seen me for many years when I met him last week."

5. **Conclusion**: The error is in part (1) of the sentence. The correct form should use the past perfect tense to properly convey the sequence of events.

### Summary of Steps:
- Identify the structure of the sentence.
- Understand the tenses used and their appropriateness.
- Correct the error by changing the tense in part (1).
- Formulate the revised sentence.
- Conclude by identifying the part with the error.