Question:medium

Choose the sentence that is grammatically correct.

Updated On: Jul 15, 2026
  • As soon as I boarded the train, I realized that I left my wallet at home.
  • As soon as I boarded the train, I realize that I had left wallet at home.
  • As soon as I board the train, I realized that I leave my wallet at home.
  • As soon as I boarded the train, I realized that I had left my wallet at home.
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The Correct Option is D

Approach Solution - 1

A good way to check this sentence is to line up the three events on a timeline and see which tense each one needs.

There are three events here, in the order they actually happened: first, the wallet gets left at home, then the person boards the train, and then the person realizes the wallet is missing. Boarding and realizing happen close together in the story, so both take the simple past tense, "boarded" and "realized." But leaving the wallet happened earlier than both of those, so it needs the past perfect tense, "had left," to mark it as the earlier event.

With this timeline in mind, "left" alone in place of "had left" fails to show that the wallet was left before boarding. Present tense forms like "realize," "board," or "leave" do not fit a story told in the past at all.

Only a version with "boarded," "realized," and "had left," in that order, matches the real sequence of events.

So, the correct answer is As soon as I boarded the train, I realized that I had left my wallet at home.

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Approach Solution -2

Reading each of these four sentences aloud, one after another, quickly reveals a small snag in three of them.

  1. Option A: "As soon as I boarded the train, I realized that I left my wallet at home." Said aloud, this comes out smoothly at first, but hearing "I realized that I left" back to back can trip the ear a little, since both actions sound like they happened at the exact same moment. Thinking it through, leaving the wallet had to happen earlier, before boarding the train, so "left" alone does not quite capture that gap.
  2. Option B: "As soon as I boarded the train, I realize that I had left wallet at home." Reading this one aloud, the switch from "boarded" to "realize" is the part that catches, since the sentence suddenly sounds like it is talking about two different times at once. On top of that, "left wallet" without "my" sounds like a word is simply missing.
  3. Option C: "As soon as I board the train, I realized that I leave my wallet at home." Said out loud, "as soon as I board" sounds like something that happens regularly or is about to happen, not something from a finished story, yet "realized" right after it clearly sounds like the past. The mismatch is audible almost immediately.
  4. Option D: "As soon as I boarded the train, I realized that I had left my wallet at home." This is the one version that reads smoothly all the way through, with no jarring switch in time and no missing word, and it clearly signals that leaving the wallet happened before the boarding and the realizing.

Once the snag in each of the other three readings is spotted, one sentence is left that reads naturally from start to finish.

So, the correct answer is As soon as I boarded the train, I realized that I had left my wallet at home.

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