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Printable one-to-one lesson plan
Modals of deduction: might, could, must
Calibrate present conclusions from stated evidence using must for a strong positive inference, cannot for a strong negative inference, and might or could for live possibilities.
Use after the complete B1 sequence, not as a lesson quiz.
Open diagnostic →15–20 minutes optional: Tutor-read observation, strong positive inference, open possibilities, strong negative inference, and contrastive stress listening check · Next-day evidence strength, present activity form, and modal-function retrieval
Derived from this lesson’s source
Lesson-specific teaching brief
This is not a second lesson registry. The plan reads the same native content that produces the learner page.
What the learner should do
Calibrate present conclusions from stated evidence using must for a strong positive inference, cannot for a strong negative inference, and might or could for live possibilities.
What must become clear
Can-do: By the end, you can separate an observation from an inference; use must for a strong positive present conclusion, can’t for a strong negative present conclusion, and might / could for possibilities; keep might not weaker than can’t ; distinguish deduction must from obligation, deduction can’t from inability, and possibility could from ability; build modal + base form and modal + be + -ing ; ask about a possible explanation naturally; and state the evidence and uncertainty behind a responsible conclusion.
High-value friction points
- Rina must be near Studio A.Do not insert to between a modal and its base verb.
- Rina can’t be in Studio B; it is empty and locked.Can’t is the clearest strong negative deduction here. Mustn’t commonly expresses prohibition in U.S. English, while full must not can be contextually ambiguous.
- Rina might be testing the microphone.A possible activity in progress uses might + be + -ing, not might + is + -ing.
Protect these lesson moments
- Reactivate three nearby systems
- Discovery check: fact, inference, and strength
- Form check: one modal, then the base form
- Strength check: what does the evidence actually support?
- Function check: the surrounding situation decides
Learner production
Observation cards: Create five neutral fictional clues about rooms, equipment, schedules, sounds, or written records. Label each observation before drawing a conclusion.
- Possibilities: Keep two explanations alive with might and could . Say what additional evidence would distinguish them.
- Strong conclusions: Use must only when several clues converge. Use can’t only when a current reliable fact directly contradicts an explanation.
- Responsible close: State one uncertainty, ask one natural possibility question, and explain how you would verify rather than present an inference as fact.
Carry this language into the next session
Retrieve Modals of deduction: might, could, must in one true sentence at the next lesson.
Use while teaching
Operational teaching notes
Choose a route before class, but change it when the learner’s production gives you better evidence.
Ask before explaining
- Which examples in “Reactivate three nearby systems” express the same core meaning?
- How would you explain this decision in your own words: Can-do: By the end, you can separate an observation from an inference; use must for a strong positive present conclusion, can’t for a strong negative present conclusion, and might / could for possibilities; keep might not weaker than can’t ; distinguish deduction must from obligation, deduction can’t from inability, and possibility could from ability; build modal + base form and modal + be + -ing ; ask about a possible explanation naturally; and state the evidence and uncertainty behind a responsible conclusion.
- What needs to change in this repair, and why: Rina must be near Studio A.
Correct for the stage
- Controlled work: correct immediately, then require the complete repaired sentence.
- Fluency building: note repeated errors and reformulate after the learner finishes the thought.
- Communication: interrupt only when meaning breaks down or the target decision is the lesson’s main evidence.
Retrieve, do not reteach
Retrieve Modals of deduction: might, could, must in one true sentence at the next lesson.
Short, core, or extended
Choose the route
All three routes end in learner production. More time means more contrast and transfer, not a longer explanation.
Short route
Retrieve for 3 minutes. Notice and discover for 8. Use the two most diagnostic tasks from Reactivate three nearby systems and Discovery check: fact, inference, and strength for 12. Protect 9 minutes for Learner production, then reflect for 3.
Core route
Follow the six-stage sequence below. Reduce repeated controlled items when accuracy is already stable, but keep the nearest useful contrast and final production.
Stretch route
Add Tutor-read observation, strong positive inference, open possibilities, strong negative inference, and contrastive stress listening check · Next-day evidence strength, present activity form, and modal-function retrieval, then repeat the communication task with a new situation or stricter success criteria.
60–70 minutes core working plan
Session sequence
Protect the final communication and reflection time. If the learner needs more support, reduce the number of controlled items instead of removing production.
- 5 min
Retrieve
Activate what the learner already controls and check any prerequisite language.
Teacher move: Open with the first practice route: Reactivate three nearby systems · Discovery check: fact, inference, and strength · Form check: one modal, then the base form.
- 6–8 min
Notice
Let the learner observe meaning and form in a small sample before naming the rule.
Teacher move: Keep the noticing conversation anchored to this decision: Can-do: By the end, you can separate an observation from an inference; use must for a strong positive present conclusion, can’t for a strong negative present conclusion, and might / could for possibilities; keep might not weaker than can’t ; distinguish deduction must from obligation, deduction can’t from inability, and possibility could from ability; build modal + base form and modal + be + -ing ; ask about a possible explanation naturally; and state the evidence and uncertainty behind a responsible conclusion.
- 8–10 min
Discover
Connect form, meaning, use, word order, and the nearest useful contrast.
Teacher move: Test the learner’s explanation against this repair: Rina must be near Studio A. Do not insert to between a modal and its base verb.
- 12–15 min
Build + drill
Move from accurate choices to faster retrieval and sentence construction.
Teacher move: Prioritize these lesson tasks: Reactivate three nearby systems · Discovery check: fact, inference, and strength · Form check: one modal, then the base form · Strength check: what does the evidence actually support?. Reduce repetitions if needed, but keep the final production time.
- 12–15 min
Communicate
Use the target language for a real adult purpose the learner cannot complete by copying.
Teacher move: Learner production: Observation cards: Create five neutral fictional clues about rooms, equipment, schedules, sounds, or written records. Label each observation before drawing a conclusion.
- 3–5 min
Reflect
Make progress visible and choose one specific next use.
Teacher move: Retrieve Modals of deduction: might, could, must in one true sentence at the next lesson.
Tutor-only source
Listening scripts
Read these lines from the tutor plan while the learner lesson remains on screen. Each clip names the learner item it supports.
Tutor-read observation, strong positive inference, open possibilities, strong negative inference, and contrastive stress listening check
- Clip 1
Read: Reception marked Rina present at two OH SEVen.
Supports: What is the discourse job of the first line?
- Clip 2
Read: She must_be near STUdio A.
Supports: What stance does must be near Studio A express?
- Clip 3
Read: She might_be INside, or she could_be in the HALLway.
Supports: What remains open in the third line?
- Clip 4
Read: She CAN’T be in Studio B; it’s EMPTY and LOCKED.
Supports: Why does the speaker use can’t in the fourth line?
- Clip 5
Read: She MIGHT be testing it. I didn’t say she MUST be.
Supports: What does contrastive stress do in the final line?
Delivery and evidence notes
- The reception record is the observation. It gives the later inferences an evidence base.
- Must marks a strong positive inference; Studio A carries the key location information.
- Might and could keep two explanations open. Each modal links into base be .
- Can’t rejects Studio B because the current checked facts contradict that location.
- Contrastive stress repairs the reasoning strength: might is intended and must is explicitly rejected.
Keep only useful evidence
After-lesson notes
These notes are for deliberate tutor records or printing. Nothing is stored in the learner’s browser.
The learner can now…
Write one observable use of the target language.
Still needs support with…
Record one repeated error, contrast, or point of hesitation.
Next retrieval prompt
Write one short prompt the learner will answer at the next session.
Anonymous live-lesson evidence
Learner pilot worksheet
B1 · Modals of deduction: might, could, must
Pilot 1 of 30 recorded · 3 remaining
Date
Approximate starting level
Core lesson time
Starting evidence
What did the learner already control? What was the first misconception, hesitation, or contrast that mattered?
Did the principle become clear?
Can-do: By the end, you can separate an observation from an inference; use must for a strong positive present conclusion, can’t for a strong negative present conclusion, and might / could for possibilities; keep might not weaker than can’t ; distinguish deduction must from obligation, deduction can’t from inability, and possibility could from ability; build modal + base form and modal + be + -ing ; ask about a possible explanation naturally; and state the evidence and uncertainty behind a responsible conclusion.
Did the first hint help?
Record the first item that caused difficulty and whether the contextual hint led to self-correction before the full repair appeared.
Could the learner do the outcome?
Calibrate present conclusions from stated evidence using must for a strong positive inference, cannot for a strong negative inference, and might or could for live possibilities.
Listen for: The learner uses the target language independently for a real purpose.
What remained available?
If possible, check before rereading in the next session. Record what returned independently and what still required a cue.
Keep, revise, or investigate?
Note any explanation the tutor still had to supply, the smallest useful revision, and whether another pilot should test the same issue.