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 must not commemorate you must not commemorate he must not commemorate we must not commemorate you must not commemorate they must not commemorate
V-ing form
I must not be commemorating you must not be commemorating he must not be commemorating we must not be commemorating you must not be commemorating they must not be commemorating
Perfect
I must not have commemorated you must not have commemorated he must not have commemorated we must not have commemorated you must not have commemorated they must not have commemorated
V-ing perfect
I must not have been commemorating you must not have been commemorating he must not have been commemorating we must not have been commemorating you must not have been commemorating they must not 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
must I not commemorate? must you not commemorate? must he not commemorate? must we not commemorate? must you not commemorate? must they not commemorate?
V-ing form
must I not be commemorating? must you not be commemorating? must he not be commemorating? must we not be commemorating? must you not be commemorating? must they not be commemorating?
Perfect
must I not have commemorated? must you not have commemorated? must he not have commemorated? must we not have commemorated? must you not have commemorated? must they not have commemorated?
V-ing perfect
must I not have been commemorating? must you not have been commemorating? must he not have been commemorating? must we not have been commemorating? must you not have been commemorating? must they not have been commemorating?