Mustn't or Don't Have to?

Quiz

Which of the following sentences is incorrect?
  1. You mustn't smoke in here.
  2. She doesn't have to come if she wants to stay home.
  3. They mustn't donate if they prefer not to.
  4. We really don't have to talk about it.

Click Here for Step-by-Step Rules, Stories and Exercises to Practice All English Tenses

Click Here for Step-by-Step Rules, Stories and Exercises to Practice All Tenses



Quiz

Answer

The incorrect sentence is sentence number three:
  • They mustn't donate if they prefer not to.


Why?

This sentence means to say that the choice is theirs. They can donate if they wish, and if they don't want to – it's ok too.
"Mustn't" turns the sentence into a command, so it's incorrect.


The same sentence corrected

To correct the sentence, we could say:
  • They don't have to donate if they prefer not to.


See also:

Synonyms and Antonyms

English Vocabulary Activities

Building Vocabulary and Some Common Mistakes

English Vocabulary Quizzes

Get Vocabulary, Grammar and Teaching Tips, Site Updates and Special Offers Directly to Your Mailbox

Join our mailing list now and get a special bonus:

First 2 chapters of the English Short Stories Book and Workbook.

Are you a teacher or a student?

* We respect your email privacy and you can unsubscribe at any time. We use MailChimp as our marketing automation platform. By clicking to submit this form, you acknowledge that the information you provide will be transferred to MailChimp for processing in accordance with their Privacy Policy and Terms.