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