He chased the thief as far as he _____.

Question

Accepted Answer

Option 4, "could," is the correct answer for the sentence "He chased the thief as far as he _____." Here's a detailed explanation justifying why Option 4 is correct and why the other options are incorrect:

1. **Explanation for Option 4 ("could"):**
   - The word "could" is the past tense of "can" and is used to indicate ability or possibility in the past. In the context of the sentence, "He chased the thief as far as he could," it implies that the person chased the thief to the maximum extent possible in the past. This usage is appropriate because it aligns with the past tense narrative of the sentence, indicating that the action of chasing happened in the past and was limited by the person's ability at that time.

2. **Why Option 1 ("may") is incorrect:**
   - "May" is used to express possibility or permission in the present or future. It does not fit the context of the sentence, which is describing a past action. Using "may" would incorrectly suggest that the action is ongoing or yet to happen, which contradicts the past tense structure of the sentence.

3. **Why Option 2 ("should") is incorrect:**
   - "Should" is used to indicate obligation, recommendation, or expectation. It does not convey the idea of ability or extent of action, which is the focus of the sentence. The sentence is about how far the person was able to chase the thief, not about what he was supposed to do or expected to do.

4. **Why Option 3 ("can") is incorrect:**
   - "Can" indicates present ability or possibility. Since the sentence is in the past tense, using "can" would be grammatically incorrect. The sentence requires a past tense verb to match the narrative, which "could" provides.

In summary, Option 4, "could," is the correct choice because it appropriately conveys the past ability of the person to chase the thief, aligning with the past tense context of the sentence. The other options do not fit the grammatical or contextual requirements of the sentence.