Workshop rules
Classify forbidden and optional actions and identify the reason for each.
TF30 · A2 Grammar · 30 min
Mustn’t or Don’t Have To
Keep “forbidden” separate from “not necessary” so you never remove a choice or permit an unsafe action.
Why this lesson matters · เหตุผลที่เรียนบทนี้
For learners: Distinguish prohibition from no necessity, preserve a listener’s real choices, and correct a practical rule misunderstanding before it causes harm.
For teachers: The route starts with the listener’s available choice, maps meaning to mustn’t or don’t have to, repairs dangerous reversals, builds an eight-rule map, tests correction through two accents and ends with an independent briefing plus focused retry.
สำหรับผู้เรียน: แยกข้อห้ามออกจากการไม่จำเป็น รักษาทางเลือกที่ผู้ฟังยังมีอยู่ และแก้ความเข้าใจผิดเกี่ยวกับกฎก่อนเกิดผลเสียจริง
สำหรับครู: ลำดับเริ่มจากดูว่าผู้ฟังยังมีทางเลือกหรือไม่ เชื่อมความหมายกับ mustn’t หรือ don’t have to แก้การกลับความหมายที่เสี่ยง สร้างแผนที่กฎแปดข้อ ฟังสองสำเนียง และจบด้วยการสรุปกฎอย่างอิสระพร้อมแก้จุดเดียวแล้วลองใหม่
Your Goal
Brief eight rules with mustn’t or don’t/doesn’t have to, preserve the listener’s choice accurately and correct one practical misunderstanding.
คำอธิบายภาษาไทย
อธิบายกฎ 8 ข้อโดยแยก mustn’t = ห้ามทำ ออกจาก don’t/doesn’t have to = ไม่จำเป็น แต่เลือกทำได้ ให้ชัดเจน และแก้ความเข้าใจผิดหนึ่งจุดที่อาจทำให้ผู้ฟังทำผิดกฎหรือเสียทางเลือก
Why this lesson matters
These two forms create opposite practical effects. Mustn’t removes permission; don’t have to removes necessity but leaves the choice open.
ภาษาไทย: สองรูปนี้ให้ผลต่างกันชัดเจน Mustn’t คือไม่อนุญาตให้ทำ ส่วน don’t have to คือไม่บังคับ ผู้ฟังยังเลือกทำได้
PROGRESS FOCUS What improves today?
MEAN · MeaningProtect the listener’s choice by separating prohibition from lack of necessity.
FORM · FormControl mustn’t + base verb and don’t/doesn’t have to + base verb.
USE · Real useBrief eight rules, answer a listener check and correct one practical misunderstanding.
Your 30-minute route
1 · 4 minProtect the choice
2 · 4 minBuild both forms
3 · 5 minDetect and repair risk
4 · 5 minMap eight rules
5 · 5 minListen and correct
6 · 7 minBrief, check and retry
Teacher Lesson Plan
Ask “Can the person still choose to do this?” before naming either form. If the answer is no, use prohibition; if the answer is yes but the action is optional, use lack of necessity.
| Stage | Teacher move | Evidence to collect |
|---|---|---|
| 1 · Meaning | Decide whether the listener has a choice before displaying forms. | Eight choice decisions |
| 2 · Form | Build mustn’t and don’t/doesn’t have to with base verbs. | Eight accurate forms |
| 3 · Risk | Find meanings that permit danger or remove an option and repair them. | Six risk decisions + three repairs |
| 4 · Plan | Map action, meaning, reason and listener check. | One balanced eight-rule map |
| 5 · Check | Use two accents to classify rules and correct one misunderstanding. | Two listening maps + first briefing |
| 6 · Perform | Score the first briefing, target one meaning/form/use weakness and retry it. | Independent eight-rule briefing |
Stage 1 · Protect the listener’s choice
Decide whether an action is forbidden or simply not necessary before choosing a form.
STUDENT TASK
ACTIONWhat action is the message about?
CHOICEIs the action forbidden, or can the listener choose?
CONSEQUENCEWhat could go wrong if the listener understands the opposite?
| Real meaning | Can the person do it? | Meaning label |
|---|---|---|
| Opening the locked cabinet is forbidden. | no | prohibition |
| Wearing the spare apron is optional. | yes | not necessary |
| Visitors are not allowed beyond this door. | no | prohibition |
| You may bring your own pen, but one is provided. | yes | not necessary |
| Sharing this access code is forbidden. | no | prohibition |
| Printing the form is optional; digital is fine. | yes | not necessary |
| Using the emergency exit for storage is forbidden. | no | prohibition |
| You may arrive early, but the room opens at nine. | yes | not necessary |
- Decide yes or no for all eight situations before naming the grammar.
- Mark which messages remove permission and which remove necessity.
- Explain two cases where the opposite meaning could cause a real problem.
Meaning contrast: “You mustn’t open it” means do not open it. “You don’t have to open it” means opening it is optional.
Finish evidenceEight choice decisions and two consequence explanations.
Teacher Help · Stage 1
Keep forms hidden until choice decisions are complete. Use the binary check “Can the person still choose to do it?” Require the learner to state the practical consequence of confusing the two meanings.
Stage 2 · Build both forms
Control mustn’t + base verb and don’t/doesn’t have to + base verb without changing the intended choice.
STUDENT TASK
| Purpose | Core form | Example |
|---|---|---|
| Prohibition | subject + mustn’t + base verb | You mustn’t open the cabinet. |
| No necessity: I/you/we/they | subject + don’t have to + base verb | You don’t have to wear the spare apron. |
| No necessity: he/she/it | subject + doesn’t have to + base verb | Mina doesn’t have to print the form. |
| Check necessity | Do/Does + subject + have to + base verb? | Do we have to bring a printed copy? |
The negative-meaning rule
Use mustn’t + base verb for prohibition. Use don’t/doesn’t have to + base verb when the action is not necessary. Keep to in have-to forms, but never add it after mustn’t.
- Build four prohibition rules and four not-necessary rules.
- Use doesn’t have to accurately at least once.
- Underline the complete negative phrase and circle every base verb.
- Say “no choice” or “choice remains” after every sentence.
Check three common repairs
“You mustn’t share the code.” · “We don’t have to print it.” · “She doesn’t have to arrive early.”
Finish evidenceEight accurate rules with the listener’s choice stated correctly.
Teacher Help · Stage 2
Correct meaning before form. Then check the complete phrase and base verb. Keep “mustn’t open” beside “doesn’t have to open” so learners see that form length does not show rule strength.
Stage 3 · Detect and repair risk
Find messages where the wrong form could permit a forbidden action or remove an available choice.
STUDENT TASK
| Intended meaning and message | Risk | Repair |
|---|---|---|
| Forbidden: You don’t have to share the code. | permits sharing | You mustn’t share the code. |
| Optional: You mustn’t print the form. | removes printing choice | You don’t have to print it. |
| Forbidden: She mustn’t to enter. | form error | She mustn’t enter. |
| Optional: Mina don’t have to arrive early. | agreement error | Mina doesn’t have to arrive early. |
| Forbidden: You mustn’t using this exit for storage. | verb-form error | You mustn’t use this exit for storage. |
| Unclear: Staff don’t have to open the cabinet. | optional or forbidden? | ask before rewriting |
Check the risk repairs
1 mustn’t share · 2 don’t have to print · 3 mustn’t enter · 4 doesn’t have to arrive · 5 mustn’t use · 6 needs the question “Is opening forbidden, or simply not necessary?”
Safety test: State whether the action is allowed before changing the grammar. Never guess a rule’s strength from one unclear sentence.
- Identify the meaning or form risk in all six messages.
- Repair messages 1–5 without changing intended choice.
- Ask a clarification question for message 6 before choosing a repair.
- Create one new high-risk contrast pair.
Finish evidenceSix risk decisions, five accurate repairs, one clarification question and one new contrast pair.
Teacher Help · Stage 3
Prioritise meaning risk over minor fluency. If an unclear message concerns safety, access, money or privacy, require clarification before correction. Then repair one layer only: meaning phrase, agreement or base verb.
Stage 4 · Map a balanced eight-rule briefing
Plan prohibited and optional actions with reasons and one listener check before speaking.
STUDENT TASK
1 · ACTIONWhat may or may not be done?
2 · CHOICE + REASONIs it forbidden or optional, and why?
3 · LISTENER CHECKHow will you confirm the listener understood the choice?
| Action | Meaning and reason | Listener check |
|---|---|---|
| open restricted cabinet | forbidden · authorised staff only | Can visitors open it? No. |
| wear spare apron | optional · useful but not required | May I wear it? Yes. |
| share access code | forbidden · protect privacy | Is sharing allowed? No. |
| bring a printed copy | optional · digital copy accepted | Can I bring one? Yes. |
- Choose one real or realistic workplace, school, travel or shared-space context.
- Plan exactly eight rules: action · choice · form · reason.
- Balance four prohibitions and four not-necessary actions.
- Write one listener check and mark the rule most dangerous to misunderstand.
Finish evidenceOne balanced eight-rule map, one listener check and one marked high-risk rule.
Teacher Help · Stage 4
Keep notes short so Stage 6 is spoken, not read. Require a practical reason and an explicit yes/no choice for every rule. Do not allow the briefing to become eight prohibitions; optional actions must preserve real choice.
Stage 5 · Listen, classify and correct
Recover whether each action is forbidden or optional, then correct one misunderstanding before it changes behaviour.
STUDENT TASK
American English
British English
Visitor choices
Recover which choices remain open and which actions are not permitted.
- Listen once for context. On the second listen, note action · allowed yes/no · form · reason.
- Retell one prohibition and one optional action from each recording.
- Give your planned eight-rule briefing to a partner.
- Your partner deliberately misunderstands one rule: “So I can/can’t do it?”
- Correct the misunderstanding, give the reason and improve one unclear rule.
Useful correction frame“No—you mustn’t ___; it is forbidden.” · “You don’t have to ___, but you can if you want to.”
Finish evidenceTwo listening maps, one first eight-rule briefing, one corrected misunderstanding and one improved rule.
Teacher Help · Stage 5
Audio never starts automatically. Use the American recording first and the British recording for transfer. If the learner catches the negative form but loses the choice, replay the action and ask “allowed: yes or no?” before showing any model.
Stage 6 · Final Practice: brief, check and retry
Deliver an independent eight-rule briefing and improve one precise choice, form or misunderstanding-repair weakness.
FINAL PRACTICE
Set choice → brief → check → correct → retry
- Use notes only: action · allowed yes/no · form · reason · check.
- Brief exactly eight rules in 60–90 seconds.
- Use four mustn’t rules and four don’t/doesn’t-have-to rules accurately.
- Give a practical reason for the rule most dangerous to misunderstand.
- Your partner asks one listener check and misunderstands one rule; correct both clearly.
- After one feedback target, retry only the weakest choice statement, form, reason or correction.
Planning example: open restricted cabinet · allowed no · mustn’t open · authorised staff only · “Can visitors open it?”
Score the first independent performance
MEAN · MeaningThe listener can tell whether each action is forbidden or optional and never loses an available choice.
FORM · FormThe learner controls mustn’t + base verb and don’t/doesn’t have to + base verb across eight rules.
USE · Real useThe briefing gives useful reasons, answers a listener check and corrects one practical misunderstanding.
0 · Not yetProhibition, optional choice or form is unclear, so the listener may act on the opposite meaning.
1 · With supportThe briefing becomes clear after an allowed-yes/no question, mustn’t cue, doesn’t cue or reason prompt.
2 · IndependentChoice, negative form, practical reason and misunderstanding correction are clear without a prompt.
Result: 0–2 Rebuild · 3–4 Developing · 5–6 A2 mastery evidence.
Finish evidenceFirst eight-rule briefing + one listener check + one corrected misunderstanding + one focused retry.
Teacher Help · Stage 6
Score the first independent briefing across MEAN, FORM and USE. Give one target only: “say whether choice remains”, “remove to after mustn’t”, “repair doesn’t have to”, “give the risk reason” or “correct the misunderstanding directly”. Keep the original score and record whether the retry improves it.
Grammar you can use
You can now separate prohibition from lack of necessity, preserve the listener’s choice and correct a misleading rule before it causes a practical problem. Use the Dynamic Learning Graph below for the next step.
Return to the Learning LibraryContinue your learning path
Must and Have To for Obligation
Learn how an obligation is created before deciding whether a choice is prohibited or simply optional.
เรียนรู้ว่าอะไรทำให้เกิดความจำเป็นก่อนตัดสินว่าทางเลือกถูกห้ามหรือเพียงไม่บังคับ
Understand a Safety Warning
Identify a prohibited action and an optional preparation item inside a practical safety warning.
จับการกระทำที่ห้ามและสิ่งเตรียมที่เลือกทำได้จากคำเตือนด้านความปลอดภัยจริง
Modal Verbs for Obligation and Permission
Integrate obligation, prohibition, no necessity and permission at B1.
รวมความหมายเรื่องหน้าที่ ข้อห้าม การไม่จำเป็น และการอนุญาตในระดับ B1
Can and Can’t for Permission and Simple Rules
Compare the sharper A2 meaning contrast with simple can/can’t permission and rules.
เปรียบเทียบความต่างที่ชัดขึ้นในระดับ A2 กับ can/can’t สำหรับกฎและการอนุญาตพื้นฐาน
