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 couldn't have you couldn't have he couldn't have we couldn't have you couldn't have they couldn't have	I couldn't be having you couldn't be having he couldn't be having we couldn't be having you couldn't be having they couldn't be having
Perfect	V-ing perfect
I couldn't have had you couldn't have had he couldn't have had we couldn't have had you couldn't have had they couldn't have had	I couldn't have been having you couldn't have been having he couldn't have been having we couldn't have been having you couldn't have been having they couldn't 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
couldn't I have? couldn't you have? couldn't he have? couldn't we have? couldn't you have? couldn't they have?	couldn't I be having? couldn't you be having? couldn't he be having? couldn't we be having? couldn't you be having? couldn't they be having?
Perfect	V-ing perfect
couldn't I have had? couldn't you have had? couldn't he have had? couldn't we have had? couldn't you have had? couldn't they have had?	couldn't I have been having? couldn't you have been having? couldn't he have been having? couldn't we have been having? couldn't you have been having? couldn't they have been having?