Rien compris Svp aider moi Merci d avance. !!! Vous me sauvez !

Il faut ajouter can, can't, must : dans la 1ere phrase: can
                                                               2eme          : must
                                                               3eme          : can
                                                               4eme          :can't , must

- Mum, can I watch television ?
- No darling, sorry, you must do your homework .
- Mum, can I play cards now ,
- No,sorry, you can't, it's too late, you must go to bed .
- Oh mum ! Can't you say "Yes, you can !" ?