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