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Modal plus be plus past participle.
Why you specifically
The rule
Modal passive is the pattern modal verb + be + past participle. The modal shows obligation, possibility, or permission, while be + past participle shows that the subject receives the action rather than does it. Common modals in this pattern are must be done, should be checked, can be repaired, may be used, and could be improved. The passive is often used when the person doing the action is unknown, unimportant, or obvious from context. Remember that the be cannot be dropped: must finished, should cleaned, and can signed are all incorrect. In a passive sentence with a modal, the form after the modal is always be + past participle.
The trap
The report must finished by Friday.
The report must be finished by Friday.
After a modal, English uses be + past participle in the passive voice.
These forms can signed online.
These forms can be signed online.
Modal passive needs be before the past participle.
The room should cleaned every day.
The room should be cleaned every day.
In the passive with a modal, the main verb must be in past participle form.
This problem could solve quickly.
This problem could be solved quickly.
Modal passive follows the pattern modal + be + past participle.
Prove it
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