Lesson 59: Unit 57 - Have to, Must, Should

About this lesson

In this lesson you will learn the difference between the modal verbs have to, must and should in English. You will understand when must is used for personal opinion and obligation, when have to emphasises an external factor or reason, and when should expresses a recommendation or the better choice. The lesson is built around an authentic text about internet etiquette (netiquette) – the rules of good behaviour in email communication. You will practise building sentences and recognising the nuances between these important grammatical structures.

40 minutes

What you'll learn

• Understand the difference between must, have to and should in positive sentences
• Form the negative forms mustn't, shouldn't and don't/doesn't have to and know the difference in their meaning
• Use the modal verbs correctly in the context of internet etiquette
• Recognise and use key vocabulary related to email communication
• Read and understand a short authentic text containing modal verbs

Lesson vocabulary

• send Every day we send and get a lot of emails.
• good manners We must teach our children good manners.
• netiquette Netiquette is good manners on the Internet.
• short Your message should be short.
• long You don't have to write long messages.
• email I write an email to my teacher every week.
• copy At work you have to send a copy to your boss.
• rude You mustn't be rude on the Internet.
• thank You must thank people for their help.
• polite You must be polite in your emails.
• reply You should reply to your messages quickly.
• message I have three new messages.
• rule There are rules for emails at work.
• mistake You should check your email for mistakes.
• address You don't have to give your email address to every website.

All lessons in this level