12 предложений с модальными глаголами can, could, should, must.

I can watch TV after I have done my homework.
I could ask my mum for help if I need it.
I should behave well in school.
I must be quiet during lesson.
I can eat dessert after lunch.
Mum, could I ask you for some pocket money? 
I should walk the dog every morning.
I must clean my room myself.
I can go for a walk with my friends on weekends.
Could you please help me with the task?
I should listen to my parents.
I must study hard.