I must diminish you must diminish she must diminish we must diminish you must diminish they must diminish
V-ing form
I must be diminishing you must be diminishing she must be diminishing we must be diminishing you must be diminishing they must be diminishing
Perfect
I must have diminished you must have diminished she 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 she 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 she 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 she 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 she 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 she 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 she diminish? must we diminish? must you diminish? must they diminish?
V-ing form
must I be diminishing? must you be diminishing? must she be diminishing? must we be diminishing? must you be diminishing? must they be diminishing?
Perfect
must I have diminished? must you have diminished? must she 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 she 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 she 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 she 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 she 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 she have been diminishing? mustn't we have been diminishing? mustn't you have been diminishing? mustn't they have been diminishing?