Answer Key

Grammar Quiz 21 – Modal Verbs 1

Choose the correct expressions.
  1. I don't believe him. He  [couldn't have taken] a train yesterday morning. There are no trains on Sundays until 4 pm!
  2. Where is Paula today? - - - I don't know. She  [may be] sick.
  3. They  [didn't have to] go there again, as it was not compulsory.
  4. I can't find the book anywhere. I  [must have left] it at the café.
  5. You  [mustn't] do that! It is very impolite!
  6. Dick doesn't seem to know about it. He  [may not have] heard your instructions.
  7. Were you  [allowed to] access the database without the manager's consent?
  8.  [Were you able] to translate the article? I think it was rather hard!
  9. You  [shouldn't have] lied to her! That was not very clever of you.
  10. Jane  [could] swim when she was four.