I can disprove you can disprove she can disprove we can disprove you can disprove they can disprove
V-ing form
I can be disproving you can be disproving she can be disproving we can be disproving you can be disproving they can be disproving
Perfect
I can have disproved you can have disproved she can have disproved we can have disproved you can have disproved they can have disproved
V-ing perfect
I can have been disproving you can have been disproving she can have been disproving we can have been disproving you can have been disproving they can have been disproving
Negation
Simple form
I cannot disprove you cannot disprove she cannot disprove we cannot disprove you cannot disprove they cannot disprove
V-ing form
I cannot be disproving you cannot be disproving she cannot be disproving we cannot be disproving you cannot be disproving they cannot be disproving
Perfect
I cannot have disproved you cannot have disproved she cannot have disproved we cannot have disproved you cannot have disproved they cannot have disproved
V-ing perfect
I cannot have been disproving you cannot have been disproving she cannot have been disproving we cannot have been disproving you cannot have been disproving they cannot have been disproving
Interrogative form
Simple form
can I disprove? can you disprove? can she disprove? can we disprove? can you disprove? can they disprove?
V-ing form
can I be disproving? can you be disproving? can she be disproving? can we be disproving? can you be disproving? can they be disproving?
Perfect
can I have disproved? can you have disproved? can she have disproved? can we have disproved? can you have disproved? can they have disproved?
V-ing perfect
can I have been disproving? can you have been disproving? can she have been disproving? can we have been disproving? can you have been disproving? can they have been disproving?
Interro-negative form
Simple form
can I not disprove? can you not disprove? can she not disprove? can we not disprove? can you not disprove? can they not disprove?
V-ing form
can I not be disproving? can you not be disproving? can she not be disproving? can we not be disproving? can you not be disproving? can they not be disproving?
Perfect
can I not have disproved? can you not have disproved? can she not have disproved? can we not have disproved? can you not have disproved? can they not have disproved?
V-ing perfect
can I not have been disproving? can you not have been disproving? can she not have been disproving? can we not have been disproving? can you not have been disproving? can they not have been disproving?