Question 1

When should I use modal passives instead of active modals?

Accepted Answer

Use modal passives when the action or result is more important than who does it. Compare: "Someone must complete this form" (active — focuses on "someone") vs "This form must be completed" (passive — focuses on the form). Modal passives are preferred in formal writing, official notices, rules, and professional communication because they sound more impersonal and objective. Signs often use them: "Cars must be parked in the designated area." They are also useful when you do not know who does the action: "The window might be repaired tomorrow" (you do not know who will repair it). In everyday conversation, active forms are more common and natural.

Question 2

How do I form negative modal passives?

Accepted Answer

Put "not" between the modal verb and "be": modal + not + be + past participle. "This document must not be copied" (it is forbidden), "The results cannot be guaranteed" (it is not possible), "This email should not be forwarded" (it is not recommended). The common contractions are "can't be," "mustn't be," "shouldn't be," and "won't be." Note that "may not be" means "is possibly not" or "is not permitted," depending on context: "The package may not be delivered today" (perhaps it will not be) vs "Food may not be eaten in the library" (it is not allowed). Understanding this double meaning of "may not" in passive sentences is important for B2 level reading.

Question 3

What are the most common modal passives in English?

Accepted Answer

The five most frequently used modal passives are: "can be" + past participle (ability or possibility: "It can be done"), "must be" + past participle (obligation: "It must be finished"), "should be" + past participle (recommendation: "It should be checked"), "will be" + past participle (future passive: "It will be sent"), and "may be" + past participle (permission or possibility: "It may be delayed"). In professional emails, you will also see "could be" and "might be" for less certain possibilities: "The meeting could be rescheduled." Practising these common forms helps you write more naturally in formal English and is excellent preparation for IELTS Writing and Cambridge exams.

Modal Passives Exercises

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