Correct Option: D. I am used to walking that distance
Explanation of the Correct Answer:
- Understanding the Original Sentence:
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The original sentence states, "I can walk that distance and have done so many times." This implies that the speaker is familiar with walking that distance and has experience doing it repeatedly.
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Analyzing Option D:
- Option D states, "I am used to walking that distance."
- The phrase "I am used to" indicates familiarity or comfort with an activity, which aligns perfectly with the idea of having walked that distance many times before.
- The use of "walking" (the gerund form) is correct here because "used to" is followed by a gerund when expressing a habitual action or state.
Why the Other Options are Incorrect:
- Option A: I am used to walk that distance
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This option is incorrect because "used to" should be followed by a gerund (walking) rather than the base form of the verb (walk). The correct form should be "I am used to walking."
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Option B: I used to walk that distance
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This option is misleading. "Used to" indicates a past habit that no longer occurs. It suggests that the speaker no longer walks that distance, which contradicts the original sentence that implies the speaker can still walk that distance and has done so many times.
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Option C: I used to walking that distance
- This option is grammatically incorrect. The phrase "used to" should be followed by the base form of the verb (walk), not a gerund. The correct form would be "I used to walk that distance," but it still implies a past habit that has ceased, making it unsuitable.
Summary of Key Points:
- The correct answer is D because it accurately reflects the meaning of being familiar with and comfortable doing an activity repeatedly.
- "I am used to" requires a gerund (walking) to indicate a current state of familiarity.
- Options A and C misuse the structure of "used to," while option B implies a past habit that no longer exists, which is not aligned with the original sentence's meaning.
Revision Summary:
- The correct option is D: I am used to walking that distance.
- "Used to" indicates familiarity and comfort with an activity.
- Always use a gerund (walking) after "am used to."
- Be cautious of the implications of "used to" regarding past habits.