Unit 6 can produce beautiful present-perfect worksheets on Friday and almost no present perfect in a learner's email three weeks later. The problem may sit in the course map. A grammar point often receives one explanation, twenty similar items and a test, then vanishes when Unit 7 begins. Learners can succeed inside the chapter because every item announces which form to use.
Grammar needs scheduled returns across later topics and skills. Each return should require a fresh choice about meaning. Otherwise the learner remembers a page heading rather than a usable form.
A unit can hide the decision
Blocked practice is tidy. A page titled “present perfect” tells the learner what answer the publisher expects before the sentence has been read, and ten affirmative items followed by ten questions create repetition while removing part of real grammar use: selecting a form among plausible alternatives.
This is why mixed grammar practice has value, as our article on making learners choose between forms explains. Recycling adds a longer time scale. The same form returns two units later in a listening transcript, a role-play and a short email. The learner has to recognise its work without the chapter label.
A recent System study of Taiwanese senior-high materials and entrance-exam writing profiled 244 CEFR B1 grammar points in Ministry-approved textbooks and a large learner corpus. Textbook grammar input was strongly front-loaded and uneven. Breadth across textbook sections was the most consistent predictor in the system-level relationship with learner outcomes. The input measures aligned more clearly with whether forms appeared in writing than with accuracy after use.
The authors state an important limit. The exam writers could not be linked to the exact textbook series or edition they studied. The analysis shows alignment across one educational system, not a causal effect of a particular book. Teachers should read it as a map of exposure, not proof that adding three appearances will produce a fixed score gain.
Return in a different job
Recycling becomes weak when it copies the original exercise because twenty more gap fills next Tuesday may strengthen the answer pattern while leaving meaning untouched, whereas a useful return changes what the grammar has to do in a fresh communicative setting.
Take the present perfect. The first encounter might contrast a finished trip last year with life experience: “I visited Seoul in 2024” and “I have visited Seoul three times.” Four days later, a listening task asks learners to identify which project updates are complete and which remain relevant now. The next week, a colleague role-play uses “Have you sent the invoice yet?” A later email asks for two updates with already and yet. The form stays recognisable. The communicative decision changes.
That sequence contains dates and consequences. It also gives a teacher different evidence. A learner who succeeds in the first contrast and fails in the invoice task may understand the timeline on paper yet lose the form under interaction speed. Another may choose the form accurately and omit the participle in writing. “Needs more present perfect” is too broad for either case.
Spacing has boundaries
Research on distribution gives no universal calendar. In a quasi-experimental study of spaced and massed L2 grammar instruction, learners received different schedules and completed immediate and delayed measures. The study helped move spacing research beyond vocabulary, but its selected grammar items, schedule and tests constrain the conclusion. A timing pattern that suits explicit rule learning may differ from one used for spontaneous speaking.
Classroom research with younger learners makes the boundary clearer. Kasprowicz and colleagues studied English-speaking children learning French verb morphology with 3.5-day and 7-day schedules. The Modern Language Journal study found no simple overall winner. Language-analytic ability interacted with learning under the shorter lag. Learner age, prior knowledge and the retention interval all matter.
So teachers need a review rhythm, plus evidence from the class. A workable starting pattern is a brief return after two or three days, another after roughly nine days, and a third in the following unit. Those numbers are a planning device, not a biological law. If the later task shows easy, accurate use, widen the interval. If learners recognise the rule and cannot deploy it, change the task before adding more explanation.
Audit the course map
Choose one grammar point from the current month and scan the next four weeks of materials, marking every appearance by skill and demand: seeing a form in a reading passage counts as exposure, choosing it in a sentence counts as controlled retrieval, using it to solve a speaking or writing problem counts as production, and correcting it after feedback adds another kind of retrieval.
The audit often reveals clusters: sixteen appearances on one day, two the next, then zero for 23 days. Move a few examples forward. A textbook does not need to be rewritten. One listening question, one warm-up comparison and one email line can carry the form into later lessons.
Avoid turning every return into a surprise test. Learners also need supported encounters where attention can move from meaning to form. In one lesson, tell them that past forms will matter and let them annotate a transcript. In the next, leave the choice open. Support and independent retrieval can alternate.
Feedback should create the next return
When an error recurs, record the context along with the form. “Article error” gives a category. “Omitted the article before a specific project name in two status emails” gives material for the next task. The teacher can place a similar noun phrase in Friday's meeting notes and check whether the learner notices it.
This is assessment for learning in a literal sense. The error changes the schedule. Act on it. A whole class may need another contrast task. One learner may need a single prompt during independent writing. Small classes make that adjustment easier because the teacher can follow a pattern across drafts and speaking turns.
There is a counterexample. A form that learners already use accurately in unprompted speech does not deserve ceremonial review just because the syllabus says “recycle.” Time should go to a live gap. Recycling is selective maintenance, guided by performance.
Open next month's lesson plan and circle one grammar point that currently disappears. Give it a new job in a later topic, far enough from its unit that the heading can no longer supply the answer.