English Grammar Guide


Modals for Orders & Commands: must/mustn't


Usage - must/mustn't

We use must and mustn't for commands, obligations and things that aren't permitted.

  • Commands
  • Obligations
  • Not Permitted

Grammar - must/mustn't

We use must and mustn't with the infinitive.

  • SUBJECT + must + INFINITIVE
  • You must do your homework.
  • You must pay tax.
  • SUBJECT + mustn't + INFINITIVE
  • You mustn't feed the lions!

Examples - must/mustn't

SUBJ.MUSTINF....
Youmustpaytax.
Youmustsubmityour essay on time!
Youmustsitdown at take-off!
Youmustn'trunon the platform!
Youmustn'tcyclehere!
Youmustn'tfeedthe lions!
Symbols & Abbreviations
INF.Infinitive
SUBJ.Subject

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