can refute
Regular verb: refute - refuted- refuted

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