could haven
Regular verb: haven - havened- havened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could haven
you could haven
she could haven
we could haven
you could haven
they could haven 	I could be havening
you could be havening
she could be havening
we could be havening
you could be havening
they could be havening	I could have havened
you could have havened
she could have havened
we could have havened
you could have havened
they could have havened	I could have been havening
you could have been havening
she could have been havening
we could have been havening
you could have been havening
they could have been havening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not haven
you could not haven
she could not haven
we could not haven
you could not haven
they could not haven 	I could not be havening
you could not be havening
she could not be havening
we could not be havening
you could not be havening
they could not be havening	I could not have havened
you could not have havened
she could not have havened
we could not have havened
you could not have havened
they could not have havened	I could not have been havening
you could not have been havening
she could not have been havening
we could not have been havening
you could not have been havening
they could not have been havening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I haven?
could you haven?
could she haven?
could we haven?
could you haven?
could they haven? 	could I be havening?
could you be havening?
could she be havening?
could we be havening?
could you be havening?
could they be havening? 	could I have havened?
could you have havened?
could she have havened?
could we have havened?
could you have havened?
could they have havened? 	could I have been havening?
could you have been havening?
could she have been havening?
could we have been havening?
could you have been havening?
could they have been havening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not haven?
could you not haven?
could she not haven?
could we not haven?
could you not haven?
could they not haven? 	could I not be havening?
could you not be havening?
could she not be havening?
could we not be havening?
could you not be havening?
could they not be havening? 	could I not have havened?
could you not have havened?
could she not have havened?
could we not have havened?
could you not have havened?
could they not have havened? 	could I not have been havening?
could you not have been havening?
could she not have been havening?
could we not have been havening?
could you not have been havening?
could they not have been havening?