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 cannot doff you cannot doff he cannot doff we cannot doff you cannot doff they cannot doff	I cannot be doffing you cannot be doffing he cannot be doffing we cannot be doffing you cannot be doffing they cannot be doffing
Perfect	V-ing perfect
I cannot have doffed you cannot have doffed he cannot have doffed we cannot have doffed you cannot have doffed they cannot have doffed	I cannot have been doffing you cannot have been doffing he cannot have been doffing we cannot have been doffing you cannot have been doffing they cannot 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 I not doff? can you not doff? can he not doff? can we not doff? can you not doff? can they not doff?	can I not be doffing? can you not be doffing? can he not be doffing? can we not be doffing? can you not be doffing? can they not be doffing?
Perfect	V-ing perfect
can I not have doffed? can you not have doffed? can he not have doffed? can we not have doffed? can you not have doffed? can they not have doffed?	can I not have been doffing? can you not have been doffing? can he not have been doffing? can we not have been doffing? can you not have been doffing? can they not have been doffing?