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A COMMON MISTAKE

“She ran ten kilometres, so she must be ill.”

What's wrong? Choose the right one.

WHY must where you mean can't (or the other way round)

must = I'm sure it's true; can't = I'm sure it isn't true.

Not: She ran ten kilometres, so she must be ill.

Say: She ran ten kilometres, so she can't be ill.

Try 6 like it

Questions where people make this mistake.

THE QUESTIONS
  1. Ana plays tennis every morning and goes cycling at weekends. She ______ a very active person.should being · must to be · can't be · must be
  2. Dan did fifty press-ups without stopping, so he ______ very strong.must being · must be · can't be
  3. Lena has just gone to bed with a high temperature, so she ______ feeling very well.must be · can't be · can't to be
  4. Mia says she feels fine and has been playing tennis all afternoon, so she ______ seriously ill.can't be · must be · can't being · doesn't must be
  5. Tom has a high temperature and a terrible cough. He ______ ill.must be · must is · must to be · can't be
  6. Ana ran ten kilometres this morning and looks fresh. She ______ unfit.can't being · can't be · must be
Show the answers
  1. must benot can't be: must where you mean can't (or the other way round)not must to be: must to, must being, must has
  2. must benot can't be: must where you mean can't (or the other way round)not must being: must to, must being, must has
  3. can't benot must be: must where you mean can't (or the other way round)not can't to be: must to, must being, must has
  4. can't benot must be: must where you mean can't (or the other way round)not can't being: must to, must being, must hasnot doesn't must be: must to, must being, must has
  5. must benot must is: must to, must being, must hasnot can't be: must where you mean can't (or the other way round)not must to be: must to, must being, must has
  6. can't benot must be: must where you mean can't (or the other way round)not can't being: must to, must being, must has