LESSON 3 Functions of modal verbs Exercise 15 Fill in the gaps with the words can, could, or the construction to be able to in the affirmative or negative form and the appropriate "Now look here, young lady, you must be home before 2.00 AM. Do you understand?"
He has to take the bus today as his car broke down yesterday.
In a mosque, you must take off your shoes before entering.
Dogs must be kept on leads.
You have to leave now if you want to catch the 9.30.
In a decent kitchen, the staff must wash their hands frequently.
"You must prepare this exercise for tomorrow!"
In Third World countries, people often have to be very ingenious simply to survive.
Our salespeople must be more persistent when dealing with customers.