1 Your father is sleeping. You mustn't be noisy.
2 Birds can fly.
3 He is late; he should run to school.
4 We don't have to book a table in the restaurant. John has already booked one for us.
5 If you are not feeling well, you should see a doctor.
6 She may come to the party but she isn't sure yet.
7 He can't drive a car. He is too young.