English verb conjugation
COULD DOFF

Regular verb: doff - doffed - doffed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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