could sponsor
Regular verb: sponsor - sponsored- sponsored

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sponsor
you could sponsor
she could sponsor
we could sponsor
you could sponsor
they could sponsor 	I could be sponsoring
you could be sponsoring
she could be sponsoring
we could be sponsoring
you could be sponsoring
they could be sponsoring	I could have sponsored
you could have sponsored
she could have sponsored
we could have sponsored
you could have sponsored
they could have sponsored	I could have been sponsoring
you could have been sponsoring
she could have been sponsoring
we could have been sponsoring
you could have been sponsoring
they could have been sponsoring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not sponsor
you could not sponsor
she could not sponsor
we could not sponsor
you could not sponsor
they could not sponsor 	I could not be sponsoring
you could not be sponsoring
she could not be sponsoring
we could not be sponsoring
you could not be sponsoring
they could not be sponsoring	I could not have sponsored
you could not have sponsored
she could not have sponsored
we could not have sponsored
you could not have sponsored
they could not have sponsored	I could not have been sponsoring
you could not have been sponsoring
she could not have been sponsoring
we could not have been sponsoring
you could not have been sponsoring
they could not have been sponsoring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sponsor?
could you sponsor?
could she sponsor?
could we sponsor?
could you sponsor?
could they sponsor? 	could I be sponsoring?
could you be sponsoring?
could she be sponsoring?
could we be sponsoring?
could you be sponsoring?
could they be sponsoring? 	could I have sponsored?
could you have sponsored?
could she have sponsored?
could we have sponsored?
could you have sponsored?
could they have sponsored? 	could I have been sponsoring?
could you have been sponsoring?
could she have been sponsoring?
could we have been sponsoring?
could you have been sponsoring?
could they have been sponsoring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not sponsor?
could you not sponsor?
could she not sponsor?
could we not sponsor?
could you not sponsor?
could they not sponsor? 	could I not be sponsoring?
could you not be sponsoring?
could she not be sponsoring?
could we not be sponsoring?
could you not be sponsoring?
could they not be sponsoring? 	could I not have sponsored?
could you not have sponsored?
could she not have sponsored?
could we not have sponsored?
could you not have sponsored?
could they not have sponsored? 	could I not have been sponsoring?
could you not have been sponsoring?
could she not have been sponsoring?
could we not have been sponsoring?
could you not have been sponsoring?
could they not have been sponsoring?