This document discusses the uses of "must", "mustn't", and "don't need to" in English. It explains that "must" expresses certainty or obligation, "mustn't" means something is forbidden or prohibited, and "don't need to" suggests something is not required. Examples are provided for each. The document also provides practice sentences for learners to complete using these terms correctly. It aims to help English learners understand and appropriately use "must", "mustn't", and "don't need to" in different contexts.

1. Must, Mustn't and Don'tMust, Mustn't and Don't
need toneed to.
2014

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1. Must
“Must” is commonly used to express
certainty. It can also be used as an internal
obligation or it's necessary to do
something.
Examples:
This must be the right address (certainty)
That must be Jerry. He's tall and blond.

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2. Mustn't
“Mustn't” or "Must not" suggests that you are
prohibited from doing something. It means that
something is not allowed; it is forbidden, and
you definitely shouldn't do it.
Examples:
My little brother mustn't enter to my room.
You mustn't smoke in any school.
(They mean "entering and smoking are not allowed in the room or any school.")

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3. Don't need to
“Don't need to” suggests that someone is not
required to do something. It means that
something is not necessary, but you can do it if
you want to -- It's up to you!
Examples:
You don't need to eat that.
(You can if you want to, but it is not necessary.)
You don't need to pass the test.
(It means "It's OK if you pass the test, but it's also OK if you don't pass it.")

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Don't forget...
Affirmative Sentence:
PERSON + MUST + INFINITIVE VERB + COMPLEMENT
You must take your medicine.
Negative Sentences:
PERSON + MUSTN'T + INFINITIVE VERB + Complement
DON'T NEED TO
She mustn't go to that party.
I don't need to eat guatitas.

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Let's Practice!!!

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Complete the sentences with Don't need to, Must and
Mustn't.
1. You ______________ smoke in a gas station.
2. You ______________ pass a test to drive a car.
3. You ______________ open up the computer while it
is plugged in.
4. Shops ______________ sell cigarettes to children.
5. This bus is free! You ____________ use it.

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Complete the sentences with Don't need to
and Mustn't.
1. You mustn't smoke in a gas station.
2. You must pass a test to drive a car.
3. You mustn't open up the computer while it
is plugged in.
4. Shops mustn't sell cigarettes to children.
5. This bus is free! You must use it.

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6.You ________ live in Canada to study at the
University of Victoria. You can take a course by
Internet.
7. In Canada, employers _________ discriminate
against women or minorities. It's against the law.
8. You ________ buy the text book for this course. It's
against the school rules don't do it.
9. Canadians ______ get a visa to travel to India.
10. You ________ be late for class, or the teacher
will be angry.

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6.You don't need to live in Canada to study at the
University of Victoria. You can take a course by
Internet.
7. In Canada, employers mustn't discriminate
against women or minorities. It's against the law.
8. You must buy the text book for this course. It's
against the school rules don't do it.
9. Canadians must get a visa to travel to India.
10. You mustn't be late for class, or the teacher
will be angry.

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Material created and selected
by
Danitza Lazcano Flores
Teacher of English
Master in Education
and
Educational Counselor