could sponsor
Regular verb: sponsor - sponsored- sponsored

Affirmation 	
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I could sponsor
you could sponsor
he could sponsor
we could sponsor
you could sponsor
they could sponsor 	I could be sponsoring
you could be sponsoring
he could be sponsoring
we could be sponsoring
you could be sponsoring
they could be sponsoring	I could have sponsored
you could have sponsored
he 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
he could have been sponsoring
we could have been sponsoring
you could have been sponsoring
they could have been sponsoring	

Negation 	
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I couldn't sponsor
you couldn't sponsor
he couldn't sponsor
we couldn't sponsor
you couldn't sponsor
they couldn't sponsor 	I couldn't be sponsoring
you couldn't be sponsoring
he couldn't be sponsoring
we couldn't be sponsoring
you couldn't be sponsoring
they couldn't be sponsoring	I couldn't have sponsored
you couldn't have sponsored
he couldn't have sponsored
we couldn't have sponsored
you couldn't have sponsored
they couldn't have sponsored	I couldn't have been sponsoring
you couldn't have been sponsoring
he couldn't have been sponsoring
we couldn't have been sponsoring
you couldn't have been sponsoring
they couldn't have been sponsoring	

Interrogative form 	
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could I sponsor?
could you sponsor?
could he sponsor?
could we sponsor?
could you sponsor?
could they sponsor? 	could I be sponsoring?
could you be sponsoring?
could he be sponsoring?
could we be sponsoring?
could you be sponsoring?
could they be sponsoring? 	could I have sponsored?
could you have sponsored?
could he 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 he 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 	
couldn't I sponsor?
couldn't you sponsor?
couldn't he sponsor?
couldn't we sponsor?
couldn't you sponsor?
couldn't they sponsor? 	couldn't I be sponsoring?
couldn't you be sponsoring?
couldn't he be sponsoring?
couldn't we be sponsoring?
couldn't you be sponsoring?
couldn't they be sponsoring? 	couldn't I have sponsored?
couldn't you have sponsored?
couldn't he have sponsored?
couldn't we have sponsored?
couldn't you have sponsored?
couldn't they have sponsored? 	couldn't I have been sponsoring?
couldn't you have been sponsoring?
couldn't he have been sponsoring?
couldn't we have been sponsoring?
couldn't you have been sponsoring?
couldn't they have been sponsoring?