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 could not institute
you could not institute
he could not institute
we could not institute
you could not institute
they could not institute 	I could not be instituting
you could not be instituting
he could not be instituting
we could not be instituting
you could not be instituting
they could not be instituting	I could not have instituted
you could not have instituted
he could not have instituted
we could not have instituted
you could not have instituted
they could not have instituted	I could not have been instituting
you could not have been instituting
he could not have been instituting
we could not have been instituting
you could not have been instituting
they could not 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 	
could I not institute?
could you not institute?
could he not institute?
could we not institute?
could you not institute?
could they not institute? 	could I not be instituting?
could you not be instituting?
could he not be instituting?
could we not be instituting?
could you not be instituting?
could they not be instituting? 	could I not have instituted?
could you not have instituted?
could he not have instituted?
could we not have instituted?
could you not have instituted?
could they not have instituted? 	could I not have been instituting?
could you not have been instituting?
could he not have been instituting?
could we not have been instituting?
could you not have been instituting?
could they not have been instituting?