Auxiliary and Modal verbs part 2

Using Auxiliary and Modal verbs

may, could, must, can’t

Meaning of Modal Auxiliary verbs

They are added before the infinitive of other verbs to give meanings connected to:

  • certainty – to say if something is possible, probable, certain or not
    • He may catch the 5 o’clock train.
    • She could be in Berlin or Hamburg, I’m not sure.
  • obligation or prohibition to do things
    • Participants must register at reception before entering the conference.
    • You can’t go in that room, it’s only for teachers.
  • permission or freedom to do things
    • You can stay as long as you want.
    • You may do what you want until the teacher arrives.