could function
Verbo regular: function - functioned- functioned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could function
you could function
she could function
we could function
you could function
they could function 	I could be functioning
you could be functioning
she could be functioning
we could be functioning
you could be functioning
they could be functioning	I could have functioned
you could have functioned
she could have functioned
we could have functioned
you could have functioned
they could have functioned	I could have been functioning
you could have been functioning
she could have been functioning
we could have been functioning
you could have been functioning
they could have been functioning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not function
you could not function
she could not function
we could not function
you could not function
they could not function 	I could not be functioning
you could not be functioning
she could not be functioning
we could not be functioning
you could not be functioning
they could not be functioning	I could not have functioned
you could not have functioned
she could not have functioned
we could not have functioned
you could not have functioned
they could not have functioned	I could not have been functioning
you could not have been functioning
she could not have been functioning
we could not have been functioning
you could not have been functioning
they could not have been functioning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I function?
could you function?
could she function?
could we function?
could you function?
could they function? 	could I be functioning?
could you be functioning?
could she be functioning?
could we be functioning?
could you be functioning?
could they be functioning? 	could I have functioned?
could you have functioned?
could she have functioned?
could we have functioned?
could you have functioned?
could they have functioned? 	could I have been functioning?
could you have been functioning?
could she have been functioning?
could we have been functioning?
could you have been functioning?
could they have been functioning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not function?
could you not function?
could she not function?
could we not function?
could you not function?
could they not function? 	could I not be functioning?
could you not be functioning?
could she not be functioning?
could we not be functioning?
could you not be functioning?
could they not be functioning? 	could I not have functioned?
could you not have functioned?
could she not have functioned?
could we not have functioned?
could you not have functioned?
could they not have functioned? 	could I not have been functioning?
could you not have been functioning?
could she not have been functioning?
could we not have been functioning?
could you not have been functioning?
could they not have been functioning?