Cover of the textbook English Grammar in Use

The key answer of exercise 51.1

The key to exercise solutions in chapter Unit 51 - Auxiliary verbs for the textbook English Grammar in Use with authors Raymond Murphy from Cambridge University Press


Complete each sentence with an auxiliary verb (do / was / could etc.). Sometimes the verb must be negative (don’t / wasn’t etc.).


  1. were
  2. doesn't
  3. was
  4. will
  5. am; isn't / 'm not; is / can; can't / can't; can / am; can't / can't is
  6. should
  7. won't
  8. do
  9. didn't
  10. would; could; can’t