Modals for rules, advice and ability
| Meaning | Modals | Material |
| Rules and obligation | must, have to, mustn't, don't have to | Must, Have To, Should, Wants and Needs, Dumb Laws |
| Advice | should, shouldn't | Must, Have To, Should, Burnout |
| Ability | can, can't | What Can You Do? |
| Possibility | might, may, could | First Impressions |
The trap at A2 is the difference between mustn't and don't have to. You mustn't park here is a rule. You don't have to pay means you can if you want. The must, have to, should worksheet makes students choose between them in context.
Mustn't vs don't have to is the contrast to test first, because the two look like opposites of must and have to, and they aren't. Ask students to sort real rules from their own workplace or city into the two groups.
Must, might and can't for deduction
At B1-B2 the same words do a new job: saying how sure you are. She must be a student means I'm almost sure. She might be a dancer means maybe. She can't be a child means I'm sure it isn't true. Students expect the opposite of must to be mustn't, and that is the mistake to watch for.
The new Modals of Deduction worksheet is built as a mystery. Students study a lost bag found on a train, with ballet shoes, a library card and 34 missed calls from Mum, and decide who it belongs to. It works as a modals of deduction worksheet for B1-B2, with modals of deduction exercises with answers. Unsolved Crimes uses the same skill on real cases and makes a natural modals of deduction ESL lesson plan for the next class.
Modal verbs in real situations
Modals matter most when there is something at stake. In Viewing a flat, students check a home and ask what they have to pay and what they can change. Understanding Road Signs is about what drivers must and mustn't do. Getting a raise, at B2-C1, uses modals to negotiate politely with a manager.
These lessons work because the modals carry real consequences. Saying you have to pay a deposit is different from saying you should pay one, and adults notice that difference when the topic is their own money or their own job.
Modal verbs FAQ
What's the difference between mustn't and don't have to?
Mustn't means it is not allowed. Don't have to means it is not necessary, but you can. The difference is small in form and big in meaning, so practice it with real rules.
When should I introduce modals of deduction?
At B1, once students are comfortable with must and can for rules and ability. Start with present deduction before must have and might have.
Are there modal verbs exercises with answers?
Yes. Every worksheet has a Teacher's Version with all the answers, and every exercise can be done alone as homework.
All modal verbs worksheets and lesson plans come with a teacher subscription.