could institute
Verbo regular: institute - instituted- instituted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could institute
you could institute
she could institute
we could institute
you could institute
they could institute 	I could be instituting
you could be instituting
she could be instituting
we could be instituting
you could be instituting
they could be instituting	I could have instituted
you could have instituted
she could have instituted
we could have instituted
you could have instituted
they could have instituted	I could have been instituting
you could have been instituting
she could have been instituting
we could have been instituting
you could have been instituting
they could have been instituting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't institute
you couldn't institute
she couldn't institute
we couldn't institute
you couldn't institute
they couldn't institute 	I couldn't be instituting
you couldn't be instituting
she couldn't be instituting
we couldn't be instituting
you couldn't be instituting
they couldn't be instituting	I couldn't have instituted
you couldn't have instituted
she couldn't have instituted
we couldn't have instituted
you couldn't have instituted
they couldn't have instituted	I couldn't have been instituting
you couldn't have been instituting
she couldn't have been instituting
we couldn't have been instituting
you couldn't have been instituting
they couldn't have been instituting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I institute?
could you institute?
could she institute?
could we institute?
could you institute?
could they institute? 	could I be instituting?
could you be instituting?
could she be instituting?
could we be instituting?
could you be instituting?
could they be instituting? 	could I have instituted?
could you have instituted?
could she have instituted?
could we have instituted?
could you have instituted?
could they have instituted? 	could I have been instituting?
could you have been instituting?
could she have been instituting?
could we have been instituting?
could you have been instituting?
could they have been instituting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I institute?
couldn't you institute?
couldn't she institute?
couldn't we institute?
couldn't you institute?
couldn't they institute? 	couldn't I be instituting?
couldn't you be instituting?
couldn't she be instituting?
couldn't we be instituting?
couldn't you be instituting?
couldn't they be instituting? 	couldn't I have instituted?
couldn't you have instituted?
couldn't she have instituted?
couldn't we have instituted?
couldn't you have instituted?
couldn't they have instituted? 	couldn't I have been instituting?
couldn't you have been instituting?
couldn't she have been instituting?
couldn't we have been instituting?
couldn't you have been instituting?
couldn't they have been instituting?