Must, Should and Need

What are we learning today?

You will learn to talk about rules, advice and what is necessary.

Explanation

• "Must" shows a strong rule. "Mustn't" means you cannot do it.
• "Should" gives advice. "Shouldn't" means it is not a good idea.
• "Need" shows that something is necessary.
• After must, mustn't, should and shouldn't, use a verb without "to".
• "Don't have to" means it is not necessary.

Examples

1. You mustn't run.
2. You should do more exercise if you want to get fit.
3. We don't have to wear a uniform.

Remember!

• Say "You should study", not "You should to study".
• "Mustn't" is not the same as "don't have to".

Check yourself

1. Which modal verb gives advice?
2. Choose: In the library you (must / mustn't) shout.