Jun believed that his slow reading came only from a small vocabulary. In a short diagnostic, however, he knew most content words in the first sentence but attached a relative clause to the wrong noun. In the second sentence, he identified the main clause but could not explain how although limited the claim. In the third, he understood both sentences yet chose an option that changed some participants into all participants. The teacher did not assign a longer word list immediately. She asked Jun to label the first breakdown in each sentence and to repeat the same check with a new passage three days later. Vocabulary review remained part of his plan, but it was tied to the words that blocked a sentence rather than to an unrelated total. For structure, he practiced attaching each clause to its head noun. For logic, he restated the claim and its limit together. The new passage would show whether these corrections survived beyond the familiar examples.