could endorse
Regular verb: endorse - endorsed- endorsed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could endorse
you could endorse
she could endorse
we could endorse
you could endorse
they could endorse 	I could be endorsing
you could be endorsing
she could be endorsing
we could be endorsing
you could be endorsing
they could be endorsing	I could have endorsed
you could have endorsed
she could have endorsed
we could have endorsed
you could have endorsed
they could have endorsed	I could have been endorsing
you could have been endorsing
she could have been endorsing
we could have been endorsing
you could have been endorsing
they could have been endorsing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not endorse
you could not endorse
she could not endorse
we could not endorse
you could not endorse
they could not endorse 	I could not be endorsing
you could not be endorsing
she could not be endorsing
we could not be endorsing
you could not be endorsing
they could not be endorsing	I could not have endorsed
you could not have endorsed
she could not have endorsed
we could not have endorsed
you could not have endorsed
they could not have endorsed	I could not have been endorsing
you could not have been endorsing
she could not have been endorsing
we could not have been endorsing
you could not have been endorsing
they could not have been endorsing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I endorse?
could you endorse?
could she endorse?
could we endorse?
could you endorse?
could they endorse? 	could I be endorsing?
could you be endorsing?
could she be endorsing?
could we be endorsing?
could you be endorsing?
could they be endorsing? 	could I have endorsed?
could you have endorsed?
could she have endorsed?
could we have endorsed?
could you have endorsed?
could they have endorsed? 	could I have been endorsing?
could you have been endorsing?
could she have been endorsing?
could we have been endorsing?
could you have been endorsing?
could they have been endorsing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not endorse?
could you not endorse?
could she not endorse?
could we not endorse?
could you not endorse?
could they not endorse? 	could I not be endorsing?
could you not be endorsing?
could she not be endorsing?
could we not be endorsing?
could you not be endorsing?
could they not be endorsing? 	could I not have endorsed?
could you not have endorsed?
could she not have endorsed?
could we not have endorsed?
could you not have endorsed?
could they not have endorsed? 	could I not have been endorsing?
could you not have been endorsing?
could she not have been endorsing?
could we not have been endorsing?
could you not have been endorsing?
could they not have been endorsing?