The document discusses different modal verbs used to express obligation, prohibition, and recommendation in English. It provides examples of must, have to, don't have to, mustn't, and should. It then has exercises for the reader to practice filling in sentences with the appropriate modal verb based on whether an action is obligatory, prohibited, or recommended.

1. Key: A) Optional
B) 1-shouldn´t 2-have to 3-mustn´t 4-have to 5-don’t have to 6- have to 7-should 8- must
C) Optional
Must, have to and should
TYPE USE MODAL VERB EXAMPLES NOTES
1 Obligation Have to/must
- Mary has to go to
the English courses.
She didn’t
understand well
the topics.
- You must see an
assistant. You have
a lot of problems
with writings.
* Must
expresses more
urgency than
have to.
* Must is only
used in the
present simple.
2 No obligation Don´t have to - He doesn’t have
to go to the English
course.
3 Prohibition Mustn´t - You mustn’t copy
in the English
exam.
4 Recommendation Should - You shouldn’t
speak Spanish. You
should speak in
English.
A) Write three rules that you have at home.
1. _____________________________________________________________________
2. _____________________________________________________________________
3. _____________________________________________________________________
B) Fill in the gaps in the next sentences with have to, must, don’t have to, mustn’t and should.
1. If you want to pass your exam, you _________ be playing Candy Crush.
2. You _________ study the phrasal verbs for your English exam. You had a lot of problems in
the last exam.
3. They _________ speak loud at the library
4. These instructions aren’t clear. I´m confuse! You ________ explain the directions better.
5. You ______________ play soccer if you don’t want.
6. The English class is too early, you _________ wake up at 6:00 am.
7. You look so bad. I think you _________ go to the doctor.
8. You _______ study vocabulary. Remember that you have a lot of problems with it in the
last test.
C) Complete the next sentences about yourself.
1. When you are at school, you _______________________________________________
2. When you are in an airplane, you ___________________________________________
3. When you take a test, you _________________________________________________
4. When you drive, you ______________________________________________________
5. When you are in a restaurant, you ___________________________________________