English verb conjugation
CAN REFUTE

Regular verb: refute - refuted - refuted

Affirmation

Simple form	V-ing form
I can refute you can refute he can refute we can refute you can refute they can refute	I can be refuting you can be refuting he can be refuting we can be refuting you can be refuting they can be refuting
Perfect	V-ing perfect
I can have refuted you can have refuted he can have refuted we can have refuted you can have refuted they can have refuted	I can have been refuting you can have been refuting he can have been refuting we can have been refuting you can have been refuting they can have been refuting

Negation

Simple form	V-ing form
I can't refute you can't refute he can't refute we can't refute you can't refute they can't refute	I can't be refuting you can't be refuting he can't be refuting we can't be refuting you can't be refuting they can't be refuting
Perfect	V-ing perfect
I can't have refuted you can't have refuted he can't have refuted we can't have refuted you can't have refuted they can't have refuted	I can't have been refuting you can't have been refuting he can't have been refuting we can't have been refuting you can't have been refuting they can't have been refuting

Interrogative form

Simple form	V-ing form
can I refute? can you refute? can he refute? can we refute? can you refute? can they refute?	can I be refuting? can you be refuting? can he be refuting? can we be refuting? can you be refuting? can they be refuting?
Perfect	V-ing perfect
can I have refuted? can you have refuted? can he have refuted? can we have refuted? can you have refuted? can they have refuted?	can I have been refuting? can you have been refuting? can he have been refuting? can we have been refuting? can you have been refuting? can they have been refuting?

Interro-negative form

Simple form	V-ing form
can't I refute? can't you refute? can't he refute? can't we refute? can't you refute? can't they refute?	can't I be refuting? can't you be refuting? can't he be refuting? can't we be refuting? can't you be refuting? can't they be refuting?
Perfect	V-ing perfect
can't I have refuted? can't you have refuted? can't he have refuted? can't we have refuted? can't you have refuted? can't they have refuted?	can't I have been refuting? can't you have been refuting? can't he have been refuting? can't we have been refuting? can't you have been refuting? can't they have been refuting?