Must

- I have seen that I haven't got anything in the kitchen. You must go to supermarket, I need some food

- My sister is going to a party on Sunday. People wants to have a "botellon". But when my mother found out, she said that she mustn't go.

- I was all the teacher said in my notebook. Then i put it on the shelf. Now, I'm worried because I can't find it. My notebook must be here somewhere...