could benefit
Regular verb: benefit - benefited- benefited

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could benefit
you could benefit
she could benefit
we could benefit
you could benefit
they could benefit 	I could be benefiting
you could be benefiting
she could be benefiting
we could be benefiting
you could be benefiting
they could be benefiting	I could have benefited
you could have benefited
she could have benefited
we could have benefited
you could have benefited
they could have benefited	I could have been benefiting
you could have been benefiting
she could have been benefiting
we could have been benefiting
you could have been benefiting
they could have been benefiting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't benefit
you couldn't benefit
she couldn't benefit
we couldn't benefit
you couldn't benefit
they couldn't benefit 	I couldn't be benefiting
you couldn't be benefiting
she couldn't be benefiting
we couldn't be benefiting
you couldn't be benefiting
they couldn't be benefiting	I couldn't have benefited
you couldn't have benefited
she couldn't have benefited
we couldn't have benefited
you couldn't have benefited
they couldn't have benefited	I couldn't have been benefiting
you couldn't have been benefiting
she couldn't have been benefiting
we couldn't have been benefiting
you couldn't have been benefiting
they couldn't have been benefiting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I benefit?
could you benefit?
could she benefit?
could we benefit?
could you benefit?
could they benefit? 	could I be benefiting?
could you be benefiting?
could she be benefiting?
could we be benefiting?
could you be benefiting?
could they be benefiting? 	could I have benefited?
could you have benefited?
could she have benefited?
could we have benefited?
could you have benefited?
could they have benefited? 	could I have been benefiting?
could you have been benefiting?
could she have been benefiting?
could we have been benefiting?
could you have been benefiting?
could they have been benefiting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I benefit?
couldn't you benefit?
couldn't she benefit?
couldn't we benefit?
couldn't you benefit?
couldn't they benefit? 	couldn't I be benefiting?
couldn't you be benefiting?
couldn't she be benefiting?
couldn't we be benefiting?
couldn't you be benefiting?
couldn't they be benefiting? 	couldn't I have benefited?
couldn't you have benefited?
couldn't she have benefited?
couldn't we have benefited?
couldn't you have benefited?
couldn't they have benefited? 	couldn't I have been benefiting?
couldn't you have been benefiting?
couldn't she have been benefiting?
couldn't we have been benefiting?
couldn't you have been benefiting?
couldn't they have been benefiting?