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Ernesto must
do his homework.
My dog mustn’t
eat my mother’s shoes.
My brothers must
study.
We mustn’t
play soccer in the lab.
Rule about must/mustn’t: ___________________________________________
_______________________________________________________________
Write
5. Complete the sentences with words in the box.
a) Students
wear the uniform at school.
b) Teachers
prepare their classes.
c) Students
eat in class.
d) Students
take books from the library with out
permission.
e) People
smoke.
f ) People
take care of the environment.
g) Students
arrive later to the school.
h) We
take care of the water.
i ) You
be careful when you walk on the street.
6. Work in groups and choose some situations from exercise 5. Discuss about
the consequences if you don’t obey the rules. After that, read them to your
classmates.
Example:
Rule: You mustn’t smoke.
Consequence: You can get lung cancer.
Check your progress
Underline
the corresponding option to complete the sentence.
We use “must” for …
We use “mustn’t” for …
a) advice
a) suggestion
b) prohibition
b) obligation
c) obligation
c) prohibition
must
mustn’t
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