Do you want to practise using 'must' and 'mustn't' in English? Play our grammar games and have fun while you learn.

Grammar Rule


I must do my homework.
You mustn’t be late for class.
We must wear our school uniform.


We can use ‘must’ to talk about rules. For the negative, we can say ‘must not’ or ‘mustn’t’.
Parents must take care of their children.
You mustn’t shout in the library.
She must not forget her books.

Be careful!

The main verb is without ‘to’.
He must be careful when cutting food.
I mustn’t make a mess.

We say... We don’t say...

You must look both ways when crossing the road. (NOT You must to look both ways when crossing the road.)
We mustn’t run in school. (NOT We mustn’t to run in school.)
Children must respect their parents. (NOT Children must respecting their parents.)

Average: 3.6 (906 votes)


Hi.The first game is not working.

Hi AluminiumMoonstoneCrystal,

The game is working ok for me. You could try using a different browser. If that still doesn't work, you could ask an adult to help you.


Best wishes,


LearnEnglish Kids team

I like it

My name is TuTi

it was easy in the first game I got 10/10 and in the second game I have got 100%............:p

I think,it's no very easy.

it was simple

  • thre are very easy  games

 both were easy games i like both of them...I got 10/10 and 100.00%

easy and nice!!!!!!!!!