You have to complete sentences with can, could, will be able to, couldnʼt, must, have to, mustnʼt, neednʼt.
They … understand French.
I … ski when I was little.
… your Granny dance when she was young?
You … respect your parents.
You … stop smoking! If you donʼt, you are going to have serious problems with your lungs some day.
We … not … buy biscuits because our Granny had baked a delicious pie.
… you … get up early tomorrow?
My sister … write this letter: I shall phone them.
They … call the doctor because the grandmother was ill.
You … argue with the headteacher.
I am sorry I … come yesterday. I … work late.
What … you … learn by heart? - At school, I … learn a beautiful poem “Leisure” by William Henry Davies.
… you … post e-mail to him tonight?