ought to disprove
Regular verb: disprove - disproved- disproved

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to disprove
you ought not to disprove
he ought not to disprove
we ought not to disprove
you ought not to disprove
they ought not to disprove 	I ought not to disproving
you ought not to disproving
he ought not to disproving
we ought not to disproving
you ought not to disproving
they ought not to disproving	I ought not to have disproved
you ought not to have disproved
he ought not to have disproved
we ought not to have disproved
you ought not to have disproved
they ought not to have disproved	I ought not to have been disproving
you ought not to have been disproving
he ought not to have been disproving
we ought not to have been disproving
you ought not to have been disproving
they ought not to have been disproving	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought I not to disprove?
ought you not to disprove?
ought he not to disprove?
ought we not to disprove?
ought you not to disprove?
ought they not to disprove? 	ought I not to be disproving?
ought you not to be disproving?
ought he not to be disproving?
ought we not to be disproving?
ought you not to be disproving?
ought they not to be disproving? 	ought I not to have disproved?
ought you not to have disproved?
ought he not to have disproved?
ought we not to have disproved?
ought you not to have disproved?
ought they not to have disproved? 	ought I not to have been disproving?
ought you not to have been disproving?
ought he not to have been disproving?
ought we not to have been disproving?
ought you not to have been disproving?
ought they not to have been disproving?