A learner says, “Yesterday I go to the client office.” The teacher has several reasonable moves. She can supply “went,” ask the learner to try the time phrase again, repeat “yesterday I...,” or save the sentence for later. Spoken correction works when the choice fits the moment and the learner gets a chance to complete the repair.
This matters to a 34-year-old account manager in Taipei who can keep a meeting moving and hears the same grammar correction every Thursday. Recognition feels easy: someone says the right form and it sounds familiar. Retrieval asks more. The learner has to find “went” while meaning, timing, and another person's attention compete for working memory. That competition explains why a form mastered on a worksheet can vanish during a client call, then return as soon as the learner sees the answer in writing.
Six ways a teacher can respond
Roy Lyster and Leila Ranta gave language teachers a useful vocabulary for feedback. In their 1997 study, they analysed 18.3 hours of interaction from 14 subject lessons and 13 French language-arts lessons in Canadian immersion classrooms. They coded six common responses: explicit correction, recasts, clarification requests, metalinguistic clues, elicitation, and repetition.
A recast supplies a corrected version without stopping to explain. Learner: “He go every day.” Teacher: “Yes, he goes every day.” Elicitation leaves a space for the learner: “He...” A metalinguistic clue points toward the rule, perhaps “third-person singular.” Repetition can put vocal stress on the troublesome part. A clarification request signals that the listener needs another attempt.
In the original peer-reviewed paper, recasts were the teachers' most frequent choice and were less likely to produce learner-generated repair than elicitation, clues, clarification requests, or repetition. The result describes immediate uptake. It does not prove that every self-repair becomes durable knowledge, and the participants were children learning French through immersion subjects. Even with those limits, the classroom transcripts expose a decision that is easy to miss in ordinary teaching: supplying a polished sentence and creating space for a learner to reconstruct one are different feedback events.
That boundary prevents a crude rule such as “recasts are bad.” Recasts can protect the flow of a story and provide a model when the learner has no form available to retrieve. A prompt becomes frustrating when the target is entirely new. Feedback needs diagnosis before technique.
Repair adds retrieval
Why ask a learner to finish the correction? The extra turn requires the brain to reconstruct the form under mild communicative pressure. The teacher can then see whether the problem was a momentary slip, uncertain knowledge, or a missing form. One repaired sentence supplies more diagnostic information than a nod after the teacher's answer.
The wider classroom evidence supports that direction. Lyster and Kazuya Saito combined 15 classroom studies with 827 learners in a 2010 meta-analysis. Oral corrective feedback showed durable benefits, and prompts had larger effects than recasts, especially on measures requiring freely constructed responses. Younger learners benefited more in their regression analysis. Meta-analysis pools unlike classrooms and targets, so its average cannot select the right response for one adult making one pronunciation error.
Alison Mackey's controlled classroom study adds another piece. She examined feedback, learners' reported noticing, and later development in English questions, plurals, and past tense. The relationship among feedback, noticing, and learning was positive and complex, with the clearest pattern for question forms. A learner has to register what the teacher is drawing attention to. A correction hidden inside ordinary conversation may pass as simple agreement.
Timing protects meaning
Constant interruption damages the activity that gives language a reason to exist. If a learner is explaining a production delay and the listener understands, stopping after every missing article can turn a coherent account into fragments. The teacher needs a hierarchy.
Correct now when the error blocks comprehension, affects the lesson's target, or repeats often enough to deserve attention. Save lower-value items on a note and discuss them after the speaker finishes. Leave some errors alone. A teacher who corrects everything teaches the learner to monitor everything at once, an impossible assignment during live speech.
I would rather hear one repaired target four times than nine corrections acknowledged with “okay.” The number is a preference, not a universal dosage.
Delayed feedback can still require retrieval. The teacher can place an anonymous sentence on screen, ask pairs to locate the problem, and return to the speaker for a new version in a fresh context. For pronunciation, she might replay or model a short phrase, mark the stressed syllable, then ask for the whole message again. The repaired item has to re-enter meaning.
The learner's level changes the move
Consider “Yesterday I go.” If the learner already uses irregular past forms elsewhere, “Yesterday I...” may be enough. If they know the rule but cannot locate the verb, the cue “past form of go” gives a narrower direction. If the form has never been taught, supplying “went” and checking meaning is kinder and faster. Later practice can create retrieval.
The same logic applies to pronunciation. A learner who cannot hear the difference between ship and sheep gains little from being told to repeat one word louder. The teacher may need a listening contrast, a mouth-position cue, or a slowed model before asking for another attempt. When the learner can finally identify the contrast in three fresh examples, the teacher has evidence for moving back into conversation and checking whether that new perception changes the next spoken attempt. Feedback and instruction overlap at that point.
Small classes give teachers more chances to learn which cue each person can use. That is one reason teacher preparation and development matters. A feedback menu helps; expertise chooses from it in less than a second.
What useful correction feels like
Good correction can be brief. It points to one feature, leaves enough silence for thought, and returns the floor. The learner knows what changed. Humiliation, sarcasm, and public scorekeeping add social threat without adding linguistic information.
A student also has a role. When the teacher supplies a form, repeat the whole phrase once and use it again with a different detail. When given a clue, resist the urge to say “I don't know” after half a second. Ask for the word if the gap is real. That exchange tells the teacher where knowledge ends.
After the next speaking lesson, keep one line from the feedback rather than a page of isolated corrections. Write the original phrase, the cue the teacher gave, and your repaired version. At the following lesson, use that version before the teacher has to supply it.