English verb conjugation
CAN DUN

Regular verb: dun - dunned - dunned

Affirmation

Simple form	V-ing form
I can dun you can dun he can dun we can dun you can dun they can dun	I can be dunning you can be dunning he can be dunning we can be dunning you can be dunning they can be dunning
Perfect	V-ing perfect
I can have dunned you can have dunned he can have dunned we can have dunned you can have dunned they can have dunned	I can have been dunning you can have been dunning he can have been dunning we can have been dunning you can have been dunning they can have been dunning

Negation

Simple form	V-ing form
I can't dun you can't dun he can't dun we can't dun you can't dun they can't dun	I can't be dunning you can't be dunning he can't be dunning we can't be dunning you can't be dunning they can't be dunning
Perfect	V-ing perfect
I can't have dunned you can't have dunned he can't have dunned we can't have dunned you can't have dunned they can't have dunned	I can't have been dunning you can't have been dunning he can't have been dunning we can't have been dunning you can't have been dunning they can't have been dunning

Interrogative form

Simple form	V-ing form
can I dun? can you dun? can he dun? can we dun? can you dun? can they dun?	can I be dunning? can you be dunning? can he be dunning? can we be dunning? can you be dunning? can they be dunning?
Perfect	V-ing perfect
can I have dunned? can you have dunned? can he have dunned? can we have dunned? can you have dunned? can they have dunned?	can I have been dunning? can you have been dunning? can he have been dunning? can we have been dunning? can you have been dunning? can they have been dunning?

Interro-negative form

Simple form	V-ing form
can't I dun? can't you dun? can't he dun? can't we dun? can't you dun? can't they dun?	can't I be dunning? can't you be dunning? can't he be dunning? can't we be dunning? can't you be dunning? can't they be dunning?
Perfect	V-ing perfect
can't I have dunned? can't you have dunned? can't he have dunned? can't we have dunned? can't you have dunned? can't they have dunned?	can't I have been dunning? can't you have been dunning? can't he have been dunning? can't we have been dunning? can't you have been dunning? can't they have been dunning?