Lesson 8: Show stance with modality
Express possibility, certainty, obligation, advice, ability, willingness, and social distance.
~50 MINUTES · MODAL MEANING
Modality is attitude toward reality
Modal verbs do more than locate time. They position a claim on scales of certainty, necessity, permission, ability, willingness, and politeness.[1]
certainty: must strong inference · may/might/could possibility · cannot impossible inference
necessity: must speaker-imposed · have to external requirement · should advice/expectation
distance: Could you…? and Would you…? often sound less direct than Can/Will you…?
Form stays compact
Core modal + base verb: She might leave, not might leaves or might to leave. Negative uses modal + not; question inverts modal and subject. Past inference uses modal + have + past participle: She might have missed the train.
Controlled practice
- Rank must, will probably, may, might, cannot by certainty.
- Distinguish “You must submit today” from “You have to submit today.”
- Make “Send the file” progressively less direct in three steps.
- Correct: “She must to leave.”
- Correct: “He might knows.”
- Infer present: lights off, door locked, no reply.
- Infer past: wet roads, umbrellas, dark clouds earlier.
- Express regret about a missed action with should have.
Check controlled answers
- Typical scale: must, will probably, may, might, cannot sits at impossible rather than low possibility.
- Must often presents speaker authority; have to often presents external rule.
- Send it. → Can you send it? → Could you send it when you have a moment?
- She must leave.
- He might know.
- Example: They may be away; they cannot be expecting anyone.
- It must have rained.
- I should have checked earlier.
Shortcut that works
Place intended meaning on scale first: impossible ↔ certain, optional ↔ necessary, direct ↔ distant. Then choose modal form.
Production lab
Retrieval practice
Your win: one recommendation expressed at five levels of certainty, necessity, and politeness.
Primary source
Use Cambridge Grammar Today on modal verbs and modality, then complete British Council B1-B2 modal exercises.