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Must, Mustn’t, don’t need to

Must is a modal verb.

Must + Infinitive :

Must = When must is used in a sentence it is used to show necessity or obligation to do something. This means that the action needs to be done.


Pronoun Example:
IMustI must go to sleep now.
WeMustWe must wake up early tomorrow.
YouMustYou must do your homework on time.
TheyMustThey must eat breakfast ever morning.
SheMustShe must clean her room.
HeMustHe must see the mess he’s created.
ItMustIt’s too hot. It must rain soon.


Must not = Mustn’t  = This means that it is necessary not to do something because it is the wrong thing to do.


Pronoun Example:
IMust not / Mustn’tI must not scream at my parents.
WeMust not / Mustn’tWe must not disrespect our parents.
YouMust not / Mustn’tYou mustn’t go to school without eating breakfast.
TheyMust not / Mustn’tThey mustn’t forget to phone grandma.
SheMust not / Mustn’tShe must not fight with her brother.
HeMust not / Mustn’tHe must not touch my things.
ItMust not / Mustn’tThe weather is lovely. It must not rain.



For the past we use had to… not must..

Example: I had to rush to work because I was late. (not I must rush to work because I was late.)


More examples:


The weather was too hot. I was so thirsty so I had to drink an ice cold drink.
The car was gone in for repair so we had to walk home from school.
The buses were not running so I had to get a lift home with my neighbour.
I had to do my homework in school because I forgot to do it last night.
She had to take her medication at lunchtime.



Don’t need to :

When we say I don’t need to something it means that it is not necessary to do it.




I don’t need to do my homework.
I don’t need to buy a new bag for school.
We don’t need to go home now.
You don’t need to shout at me.
They don’t need to help me cook dinner.
You don’t need to take your brother swimming.
I don’t need to cook dinner tonight because we are ordering food.


You can also say I don’t have to instead of I don’t need to (to show that it is not necessary to do the action)




I don’t have to go home right now.
I don’t have to sleep early tonight.
I don’t have to help my mum in the kitchen.
We don’t have to bake a cake for dad’s birthday.
They don’t have to drive themselves to the airport.


Compare don’t need to and mustn’t.


You don’t need to go.

You mustn’t go.

You don’t need to complain about everything.

You mustn’t complain about everything.

You don’t need to scream at mum.

You mustn’t scream at mum



Must, Mustn’t, Don’t need to Exercise..


  1. Complete the sentence.


Mustn’t is the contraction of _______________________________________


  1. Name 5 infinitive verbs and create sentences using each infinitive in each sentence.


Infinitive verb


I must…


You must…


They must…


He must…


We must…


  1. Fill in the missing gaps with must or must not where appropriate.


  • I ________________ listen to my parents.

  • I ________________ disrespect your elders.

  • I _______________ eat breakfast every morning.

  • I ________________ listen to my teacher.

  • I ________________ do my homework.

  • I _________________ get into fights with people.

  • I _________________ shout out in class.

  • I _________________ work hard.

  • I _________________ leave the house without cleaning my bedroom.


  1. Complete the sentences.


  • I don’t need to ______________________________________________________

  • I don’t need to ______________________________________________________

  • I don’t have to ______________________________________________________

  • I don’t have to ______________________________________________________

  • I had to ____________________________________________________________

  • I had to ____________________________________________________________


Challenge: Create 3 comparisons of don’t need to and mustn’t.



You don’t need to go

You mustn’t go



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