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Mustn’t and needn’t.

Mustn’t and needn’t are not the same.

Stairs and escalator up to a fitness centre. Everyone is using the escalator.

I mustn’t eat so much food. I needn’t use the steps.

We use mustn’t when something should not be done.
• I mustn’t forget to do my homework.
(Remember to do my homework)
• You mustn’t walk on the road.
(Do not walk on the road)

We use needn’t when you have a choice to do something or not.
• I needn’t do my homework tonight because the lesson is next week.
(You can do your homework, or not. Your choice)
• You needn’t bring some water because I have some.
(You can bring water, or not. Your choice)

Remember: Mustn’t is no, no, no. Needn’t is your choice.
  • Exercise 1

    Remember: Mustn’t is no, no, no. Needn’t is your choice.

    Complete each sentence with either mustn’t or needn’t.

    Remember: Mustn’t is no, no, no. Needn’t is your choice.

    Complete each sentence with either mustn’t or needn’t.

    Exercise 2

    Complete each sentence with either mustn’t or needn’t.

    Complete each sentence with either mustn’t or needn’t.

  • Remember: Mustn’t is no, no, no. Needn’t is your choice.

    You mustn’t eat before opening.

     Stupid instructions on a pizza box. It says you must open the box before eating the pizza.