English verb conjugation
MUST DOFF

Regular verb: doff - doffed - doffed

Affirmation

Simple form	V-ing form
I must doff you must doff he must doff we must doff you must doff they must doff	I must be doffing you must be doffing he must be doffing we must be doffing you must be doffing they must be doffing
Perfect	V-ing perfect
I must have doffed you must have doffed he must have doffed we must have doffed you must have doffed they must have doffed	I must have been doffing you must have been doffing he must have been doffing we must have been doffing you must have been doffing they must have been doffing

Negation

Simple form	V-ing form
I must not doff you must not doff he must not doff we must not doff you must not doff they must not doff	I must not be doffing you must not be doffing he must not be doffing we must not be doffing you must not be doffing they must not be doffing
Perfect	V-ing perfect
I must not have doffed you must not have doffed he must not have doffed we must not have doffed you must not have doffed they must not have doffed	I must not have been doffing you must not have been doffing he must not have been doffing we must not have been doffing you must not have been doffing they must not have been doffing

Interrogative form

Simple form	V-ing form
must I doff? must you doff? must he doff? must we doff? must you doff? must they doff?	must I be doffing? must you be doffing? must he be doffing? must we be doffing? must you be doffing? must they be doffing?
Perfect	V-ing perfect
must I have doffed? must you have doffed? must he have doffed? must we have doffed? must you have doffed? must they have doffed?	must I have been doffing? must you have been doffing? must he have been doffing? must we have been doffing? must you have been doffing? must they have been doffing?

Interro-negative form

Simple form	V-ing form
must I not doff? must you not doff? must he not doff? must we not doff? must you not doff? must they not doff?	must I not be doffing? must you not be doffing? must he not be doffing? must we not be doffing? must you not be doffing? must they not be doffing?
Perfect	V-ing perfect
must I not have doffed? must you not have doffed? must he not have doffed? must we not have doffed? must you not have doffed? must they not have doffed?	must I not have been doffing? must you not have been doffing? must he not have been doffing? must we not have been doffing? must you not have been doffing? must they not have been doffing?