Point out the part that has an error in the sentence.
You are learning English (A) for the last one year (B) but you show (C) no improvement at all. (D)

Question

Point out the part that has an error in the sentence. 
You are learning English (A) for the last one year (B) but you show (C) no improvement at all. (D)

Accepted Answer

The correct answer is Option 2, which corresponds to part (A) of the sentence.

**Detailed Explanation:**

1.  **Why Option 2 (Part A) is correct:**
    The phrase "for the last one year" indicates a duration of time that started in the past and continues up to the present moment. When an action began in the past and is still ongoing, the appropriate tense to use is the **present perfect continuous tense**. The present perfect continuous tense is formed with "have/has been + -ing form of the verb" (e.g., "have been learning").
    Part (A) of the sentence uses "You are learning English," which is in the **present continuous tense**. The present continuous tense is used for actions happening right now or around the present time, or for planned future events. It is generally not used with "for + duration" to express an action that started in the past and continues to the present.
    Therefore, to correctly convey the meaning that the learning started a year ago and is still continuing, the sentence should be "You **have been learning** English for the last one year." The use of "are learning" makes part (A) grammatically incorrect in this context.

2.  **Why other options are incorrect:**

*   **Option 1 (Part B): "for the last one year"**
        This phrase is grammatically correct and appropriately indicates a duration of time from the past up to the present. It correctly signals the need for a perfect continuous or perfect tense in the preceding clause. Thus, there is no error in this part.

*   **Option 3 (Part C): "but you show"**
        "But" is a correct conjunction used to introduce a contrasting idea. "You show" is in the simple present tense, which is suitable for stating a general fact or a current state (the lack of improvement). This part is grammatically sound and correctly links the two clauses.

*   **Option 4 (Part D): "no improvement at all."**
        "No improvement" is a correct noun phrase, and "at all" is an intensifier correctly used with negative statements to emphasize the complete absence of improvement. This part is grammatically correct and makes sense in the context of the sentence.