can disprove
Regular verb: disprove - disproved- disproved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can disprove
you can disprove
he can disprove
we can disprove
you can disprove
they can disprove 	I can be disproving
you can be disproving
he can be disproving
we can be disproving
you can be disproving
they can be disproving	I can have disproved
you can have disproved
he can have disproved
we can have disproved
you can have disproved
they can have disproved	I can have been disproving
you can have been disproving
he can have been disproving
we can have been disproving
you can have been disproving
they can have been disproving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't disprove
you can't disprove
he can't disprove
we can't disprove
you can't disprove
they can't disprove 	I can't be disproving
you can't be disproving
he can't be disproving
we can't be disproving
you can't be disproving
they can't be disproving	I can't have disproved
you can't have disproved
he can't have disproved
we can't have disproved
you can't have disproved
they can't have disproved	I can't have been disproving
you can't have been disproving
he can't have been disproving
we can't have been disproving
you can't have been disproving
they can't have been disproving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I disprove?
can you disprove?
can he disprove?
can we disprove?
can you disprove?
can they disprove? 	can I be disproving?
can you be disproving?
can he be disproving?
can we be disproving?
can you be disproving?
can they be disproving? 	can I have disproved?
can you have disproved?
can he have disproved?
can we have disproved?
can you have disproved?
can they have disproved? 	can I have been disproving?
can you have been disproving?
can he have been disproving?
can we have been disproving?
can you have been disproving?
can they have been disproving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I disprove?
can't you disprove?
can't he disprove?
can't we disprove?
can't you disprove?
can't they disprove? 	can't I be disproving?
can't you be disproving?
can't he be disproving?
can't we be disproving?
can't you be disproving?
can't they be disproving? 	can't I have disproved?
can't you have disproved?
can't he have disproved?
can't we have disproved?
can't you have disproved?
can't they have disproved? 	can't I have been disproving?
can't you have been disproving?
can't he have been disproving?
can't we have been disproving?
can't you have been disproving?
can't they have been disproving?