Modal Verbs: must, should, need

What are we learning today?

You will learn to say what is forbidden, necessary and a good idea.

Explanation

• Mustn't means it is forbidden.
• Must means it is necessary.
• Should and shouldn't give advice.
• Need to means it is necessary.
• Don't have to means it is not necessary.
• After a modal verb, use the infinitive without to.

Examples

1. You mustn't run!
2. You shouldn't watch TV so late if you're tired.
3. First, you need to press the round button.
4. We don't have to wear a uniform.

Remember!

• Mustn't means forbidden. Don't have to means not necessary.
• Say "You must tidy", not "must to tidy".

Check yourself

1. Complete: You ___ throw litter on the floor. (must / mustn't)
2. Which modal gives advice: must or should?
3. Make advice with should: You / drink more water.