Modal Scales: Certainty and Obligation

Worked classroom example

Science

Worked example

Choose may, must or cannot to match the strength of an inference from results.

Use this example to make the language move visible. Select subject content appropriate to the class’s age and prior knowledge.

Teaching sequence

1. Set up modal cards and a meaning continuum; name the subject question and show a short model of the task.
2. Learners place modal verbs on a certainty or obligation scale and justify the choice in context. Give quiet thinking time before pairs or groups compare what they noticed.
3. Ask each learner to share or record one independent response. Use the example from Science to check the idea, then fade one prompt on the next attempt.

Try it in your next lesson

Prepare

Use modal cards and a meaning continuum. Choose a second example that checks the same language move without repeating the original answer.

Classroom task

Place modal verbs on a certainty or obligation scale and justify the choice in context.

Check independent transfer

Ask each learner to share or record one independent response. Use the example from Science to check the idea, then fade one prompt on the next attempt.

Collect a response on fresh content. Note what was achieved without the model, partner or teacher prompt, then choose one next teaching step.

Teacher language

Teacher language

What in the example makes you say that?

Respond to the learner

Identify one successful meaning or language choice. Ask about one gap, allow thinking time, then invite a revision. Check the revised move again on a fresh example.

Adjust support and challenge

Offer a brief model, useful vocabulary and partner rehearsal where needed. Keep the subject goal; reduce one prompt on fresh content and record what was independent.

Teaching this skill → · Age and language support →

More support

Contrast two meaningful sentences, represent the difference visually and rehearse a new example. Check meaning before naming the rule. Allow familiar-language notes or another response mode when checking subject understanding.

Greater independence

Change the content, evidence or audience. Remove the completed model and ask learners to explain a choice. Increase subject complexity only when it fits the curriculum and prior knowledge.

Choose the next step

If subject meaning is insecure, reteach the concept. If the concept is understood but the English is unclear, model one useful language relationship and invite a fresh response.