Must, have to, should

Obligation, prohibition, lack of necessity and advice with must, have to and should

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1. 1
   Multiple choice

   You wear a seatbelt in a car. It's the law.

   mustmustn'tdon't have toneedn'tWe use 'must' for strong obligations such as rules and laws.
2. 2
   Multiple choice

   You smoke in the hospital. It's forbidden.

   don't have tohave tomustn'tshould'Mustn't' means something is not allowed.
3. 3
   Multiple choice

   Tomorrow is Saturday, so I get up early.

   mustn'tdon't have tomusthave to'Don't have to' means it is not necessary.
4. 4
   Multiple choice

   You look tired. You go to bed earlier.

   shouldn'tmustn'tdon't have toshouldWe use 'should' to give advice.
5. 5
   Fill the gap

   Yesterday I stay at work late because of a meeting.

   musthad tohave toshould'Must' has no past form, so we use 'had to' for obligation in the past.
6. 6
   Fill the gap

   My sister is a nurse, so she (have to) work at night every week.

   Answer: has toWith he/she/it we say 'has to'.
7. 7
   Fill the gap

   How often you have to travel for work these days?

   Answer: doQuestions with 'have to' in the present use 'do' or 'does'.
8. 8
   Fill the gap

   You tell anyone my secret! Promise me.

   don't have tomustmustn'tshouldAlso accepted: must not'Mustn't' is used when something is not allowed.
9. 9
   Fill the gap

   We to wear a helmet on the building site. It's one of the rules.

   Answer: haveAlso accepted: need'Have to' often describes rules made by other people.
10. 10
    True / false

    This sentence is correct: 'She must to leave before eight.'

    Answer: FalseAfter 'must' we use the infinitive without 'to': 'She must leave.'
11. 11
    Discussion question

    What rules did you have to follow at school? Which of them were useful?

    Sample answer: We had to wear a uniform and we weren't allowed to use our phones in class. The phone rule was useful because we paid more attention.
12. 12
    Discussion question

    What advice would you give someone who wants to learn English quickly?

    Sample answer: You should practise every day and you have to speak as much as possible. You don't have to understand every word in a film.