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Modal Forms

Modal verbs can be used in a variety of different forms. Study the examples below.

Modal Simple
I should clean the room once a day.
Passive Modal Simple
The room should be cleaned once a day.
Modal Continuous
I should be cleaning the room now.
Passive Modal Continuous
The room should be being cleaned now.
Modal Perfect
I should have cleaned the room yesterday.
Passive Modal Perfect
The room should have been cleaned yesterday.
Modal Perfect Continuous
I should have been cleaning the room instead of watching TV.
Passive Modal Perfect Continuous
The room should have been being cleaned but nobody was there. (Rare form)

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