I must enlighten you must enlighten he must enlighten we must enlighten you must enlighten they must enlighten
V-ing form
I must be enlightening you must be enlightening he must be enlightening we must be enlightening you must be enlightening they must be enlightening
Perfect
I must have enlightened you must have enlightened he must have enlightened we must have enlightened you must have enlightened they must have enlightened
V-ing perfect
I must have been enlightening you must have been enlightening he must have been enlightening we must have been enlightening you must have been enlightening they must have been enlightening
Negation
Simple form
I mustn't enlighten you mustn't enlighten he mustn't enlighten we mustn't enlighten you mustn't enlighten they mustn't enlighten
V-ing form
I mustn't be enlightening you mustn't be enlightening he mustn't be enlightening we mustn't be enlightening you mustn't be enlightening they mustn't be enlightening
Perfect
I mustn't have enlightened you mustn't have enlightened he mustn't have enlightened we mustn't have enlightened you mustn't have enlightened they mustn't have enlightened
V-ing perfect
I mustn't have been enlightening you mustn't have been enlightening he mustn't have been enlightening we mustn't have been enlightening you mustn't have been enlightening they mustn't have been enlightening
Interrogative form
Simple form
must I enlighten? must you enlighten? must he enlighten? must we enlighten? must you enlighten? must they enlighten?
V-ing form
must I be enlightening? must you be enlightening? must he be enlightening? must we be enlightening? must you be enlightening? must they be enlightening?
Perfect
must I have enlightened? must you have enlightened? must he have enlightened? must we have enlightened? must you have enlightened? must they have enlightened?
V-ing perfect
must I have been enlightening? must you have been enlightening? must he have been enlightening? must we have been enlightening? must you have been enlightening? must they have been enlightening?
Interro-negative form
Simple form
mustn't I enlighten? mustn't you enlighten? mustn't he enlighten? mustn't we enlighten? mustn't you enlighten? mustn't they enlighten?
V-ing form
mustn't I be enlightening? mustn't you be enlightening? mustn't he be enlightening? mustn't we be enlightening? mustn't you be enlightening? mustn't they be enlightening?
Perfect
mustn't I have enlightened? mustn't you have enlightened? mustn't he have enlightened? mustn't we have enlightened? mustn't you have enlightened? mustn't they have enlightened?
V-ing perfect
mustn't I have been enlightening? mustn't you have been enlightening? mustn't he have been enlightening? mustn't we have been enlightening? mustn't you have been enlightening? mustn't they have been enlightening?