I must enlighten you must enlighten she must enlighten we must enlighten you must enlighten they must enlighten
V-ing form
I must be enlightening you must be enlightening she must be enlightening we must be enlightening you must be enlightening they must be enlightening
Perfect
I must have enlightened you must have enlightened she 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 she 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 she 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 she 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 she 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 she 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 she enlighten? must we enlighten? must you enlighten? must they enlighten?
V-ing form
must I be enlightening? must you be enlightening? must she be enlightening? must we be enlightening? must you be enlightening? must they be enlightening?
Perfect
must I have enlightened? must you have enlightened? must she 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 she 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 she 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 she 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 she 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 she have been enlightening? mustn't we have been enlightening? mustn't you have been enlightening? mustn't they have been enlightening?