English verb conjugation
COULD HAVE

Irregular verb: have - had - had

Affirmation

Simple form	V-ing form
I could have you could have he could have we could have you could have they could have	I could be having you could be having he could be having we could be having you could be having they could be having
Perfect	V-ing perfect
I could have had you could have had he could have had we could have had you could have had they could have had	I could have been having you could have been having he could have been having we could have been having you could have been having they could have been having

Negation

Simple form	V-ing form
I could not have you could not have he could not have we could not have you could not have they could not have	I could not be having you could not be having he could not be having we could not be having you could not be having they could not be having
Perfect	V-ing perfect
I could not have had you could not have had he could not have had we could not have had you could not have had they could not have had	I could not have been having you could not have been having he could not have been having we could not have been having you could not have been having they could not have been having

Interrogative form

Simple form	V-ing form
could I have? could you have? could he have? could we have? could you have? could they have?	could I be having? could you be having? could he be having? could we be having? could you be having? could they be having?
Perfect	V-ing perfect
could I have had? could you have had? could he have had? could we have had? could you have had? could they have had?	could I have been having? could you have been having? could he have been having? could we have been having? could you have been having? could they have been having?

Interro-negative form

Simple form	V-ing form
could I not have? could you not have? could he not have? could we not have? could you not have? could they not have?	could I not be having? could you not be having? could he not be having? could we not be having? could you not be having? could they not be having?
Perfect	V-ing perfect
could I not have had? could you not have had? could he not have had? could we not have had? could you not have had? could they not have had?	could I not have been having? could you not have been having? could he not have been having? could we not have been having? could you not have been having? could they not have been having?