could institute
Verbo regular: institute - instituted- instituted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could institute
you could institute
he could institute
we could institute
you could institute
they could institute 	I could be instituting
you could be instituting
he could be instituting
we could be instituting
you could be instituting
they could be instituting	I could have instituted
you could have instituted
he 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
he could have been instituting
we could have been instituting
you could have been instituting
they could have been instituting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't institute
you couldn't institute
he 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
he 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
he 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
he 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 com V-ing 	Perfeito 	Perfeito com V-ing 	
could I institute?
could you institute?
could he institute?
could we institute?
could you institute?
could they institute? 	could I be instituting?
could you be instituting?
could he be instituting?
could we be instituting?
could you be instituting?
could they be instituting? 	could I have instituted?
could you have instituted?
could he 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 he have been instituting?
could we have been instituting?
could you have been instituting?
could they have been instituting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I institute?
couldn't you institute?
couldn't he 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 he 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 he 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 he have been instituting?
couldn't we have been instituting?
couldn't you have been instituting?
couldn't they have been instituting?