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