could prove
Irregular verb: prove - proved- proven

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could prove
you could prove
she could prove
we could prove
you could prove
they could prove 	I could be proving
you could be proving
she could be proving
we could be proving
you could be proving
they could be proving	I could have proven
you could have proven
she could have proven
we could have proven
you could have proven
they could have proven	I could have been proving
you could have been proving
she could have been proving
we could have been proving
you could have been proving
they could have been proving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't prove
you couldn't prove
she couldn't prove
we couldn't prove
you couldn't prove
they couldn't prove 	I couldn't be proving
you couldn't be proving
she couldn't be proving
we couldn't be proving
you couldn't be proving
they couldn't be proving	I couldn't have proven
you couldn't have proven
she couldn't have proven
we couldn't have proven
you couldn't have proven
they couldn't have proven	I couldn't have been proving
you couldn't have been proving
she couldn't have been proving
we couldn't have been proving
you couldn't have been proving
they couldn't have been proving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I prove?
could you prove?
could she prove?
could we prove?
could you prove?
could they prove? 	could I be proving?
could you be proving?
could she be proving?
could we be proving?
could you be proving?
could they be proving? 	could I have proven?
could you have proven?
could she have proven?
could we have proven?
could you have proven?
could they have proven? 	could I have been proving?
could you have been proving?
could she have been proving?
could we have been proving?
could you have been proving?
could they have been proving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I prove?
couldn't you prove?
couldn't she prove?
couldn't we prove?
couldn't you prove?
couldn't they prove? 	couldn't I be proving?
couldn't you be proving?
couldn't she be proving?
couldn't we be proving?
couldn't you be proving?
couldn't they be proving? 	couldn't I have proven?
couldn't you have proven?
couldn't she have proven?
couldn't we have proven?
couldn't you have proven?
couldn't they have proven? 	couldn't I have been proving?
couldn't you have been proving?
couldn't she have been proving?
couldn't we have been proving?
couldn't you have been proving?
couldn't they have been proving?