English verb conjugation
CAN DOFF

Regular verb: doff - doffed - doffed

Affirmation

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

Negation

Simple form	V-ing form
I can't doff you can't doff he can't doff we can't doff you can't doff they can't doff	I can't be doffing you can't be doffing he can't be doffing we can't be doffing you can't be doffing they can't be doffing
Perfect	V-ing perfect
I can't have doffed you can't have doffed he can't have doffed we can't have doffed you can't have doffed they can't have doffed	I can't have been doffing you can't have been doffing he can't have been doffing we can't have been doffing you can't have been doffing they can't have been doffing

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can't I doff? can't you doff? can't he doff? can't we doff? can't you doff? can't they doff?	can't I be doffing? can't you be doffing? can't he be doffing? can't we be doffing? can't you be doffing? can't they be doffing?
Perfect	V-ing perfect
can't I have doffed? can't you have doffed? can't he have doffed? can't we have doffed? can't you have doffed? can't they have doffed?	can't I have been doffing? can't you have been doffing? can't he have been doffing? can't we have been doffing? can't you have been doffing? can't they have been doffing?