could attend
Verbo regular: attend - attended- attended

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could attend
you could attend
she could attend
we could attend
you could attend
they could attend 	I could be attending
you could be attending
she could be attending
we could be attending
you could be attending
they could be attending	I could have attended
you could have attended
she could have attended
we could have attended
you could have attended
they could have attended	I could have been attending
you could have been attending
she could have been attending
we could have been attending
you could have been attending
they could have been attending	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not attend
you could not attend
she could not attend
we could not attend
you could not attend
they could not attend 	I could not be attending
you could not be attending
she could not be attending
we could not be attending
you could not be attending
they could not be attending	I could not have attended
you could not have attended
she could not have attended
we could not have attended
you could not have attended
they could not have attended	I could not have been attending
you could not have been attending
she could not have been attending
we could not have been attending
you could not have been attending
they could not have been attending	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I attend?
could you attend?
could she attend?
could we attend?
could you attend?
could they attend? 	could I be attending?
could you be attending?
could she be attending?
could we be attending?
could you be attending?
could they be attending? 	could I have attended?
could you have attended?
could she have attended?
could we have attended?
could you have attended?
could they have attended? 	could I have been attending?
could you have been attending?
could she have been attending?
could we have been attending?
could you have been attending?
could they have been attending? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not attend?
could you not attend?
could she not attend?
could we not attend?
could you not attend?
could they not attend? 	could I not be attending?
could you not be attending?
could she not be attending?
could we not be attending?
could you not be attending?
could they not be attending? 	could I not have attended?
could you not have attended?
could she not have attended?
could we not have attended?
could you not have attended?
could they not have attended? 	could I not have been attending?
could you not have been attending?
could she not have been attending?
could we not have been attending?
could you not have been attending?
could they not have been attending?