English verb conjugation
CAN REFUTE

Regular verb: refute - refuted - refuted

Affirmation

Simple form	V-ing form
I can refute you can refute she can refute we can refute you can refute they can refute	I can be refuting you can be refuting she 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 she 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 she 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 cannot refute you cannot refute she cannot refute we cannot refute you cannot refute they cannot refute	I cannot be refuting you cannot be refuting she cannot be refuting we cannot be refuting you cannot be refuting they cannot be refuting
Perfect	V-ing perfect
I cannot have refuted you cannot have refuted she cannot have refuted we cannot have refuted you cannot have refuted they cannot have refuted	I cannot have been refuting you cannot have been refuting she cannot have been refuting we cannot have been refuting you cannot have been refuting they cannot have been refuting

Interrogative form

Simple form	V-ing form
can I refute? can you refute? can she refute? can we refute? can you refute? can they refute?	can I be refuting? can you be refuting? can she 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 she 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 she 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 I not refute? can you not refute? can she not refute? can we not refute? can you not refute? can they not refute?	can I not be refuting? can you not be refuting? can she not be refuting? can we not be refuting? can you not be refuting? can they not be refuting?
Perfect	V-ing perfect
can I not have refuted? can you not have refuted? can she not have refuted? can we not have refuted? can you not have refuted? can they not have refuted?	can I not have been refuting? can you not have been refuting? can she not have been refuting? can we not have been refuting? can you not have been refuting? can they not have been refuting?