A passive instruction can focus on the item: the panels, form or door. The modal still contributes meaning—possibility, advice, permission or obligation—just as it does in an active sentence.
The idea
Use modal + be + past participle: can be completed, should be checked. Negatives place not after the modal: must not be blocked. Questions put the modal first: Can the form be completed online? With have to, retain to: have to be printed.
Examples
- These glass panels must be carried upright.
- The form can be completed online.
- The address should be checked before dispatch.
- Tickets may be exchanged at the desk.
- The old files don't have to be printed.
- This door must not be blocked.
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Watch out
Do not replace be with is/are after a modal. Here must not be blocked forbids blocking; doesn't have to be blocked would only remove a requirement. Changing voice does not remove that difference.
Try it yourself
Choose the correct option. These panels must ___ carried upright. (be / been)
Show answer or example answer
be
After must, use base form be. Been would need a different construction, such as must have been carried.
Choose the correct option. The form can be ___ online. (completed / complete)
Show answer or example answer
completed
Completed is the participle in can be completed. Base form complete would not finish this passive construction.
Blocking the door is forbidden. Choose the matching rule. This door ___ be blocked. (must not / does not have to)
Show answer or example answer
must not
Must not expresses the stated prohibition. Does not have to would mean blocking is unnecessary, not forbidden.
Practice round
Answer questions and rebuild English sentences to practise. Your score is shown.
Choose the correct option. These panels must ___ carried upright. (be / been)
Choose the correct option. The form can be ___ online. (completed / complete)
Blocking the door is forbidden. Choose the matching rule. This door ___ be blocked. (must not / does not have to)
Tap the words in the right order.
Tap the words in the right order.
Tap the words in the right order.
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Write a short notice about returning borrowed equipment: one requirement, one recommendation and one optional action. Use passive forms, then explain which action is required and which remains a choice.