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