could explain
Verbo regular: explain - explained- explained

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could explain
you could explain
she could explain
we could explain
you could explain
they could explain 	I could be explaining
you could be explaining
she could be explaining
we could be explaining
you could be explaining
they could be explaining	I could have explained
you could have explained
she could have explained
we could have explained
you could have explained
they could have explained	I could have been explaining
you could have been explaining
she could have been explaining
we could have been explaining
you could have been explaining
they could have been explaining	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not explain
you could not explain
she could not explain
we could not explain
you could not explain
they could not explain 	I could not be explaining
you could not be explaining
she could not be explaining
we could not be explaining
you could not be explaining
they could not be explaining	I could not have explained
you could not have explained
she could not have explained
we could not have explained
you could not have explained
they could not have explained	I could not have been explaining
you could not have been explaining
she could not have been explaining
we could not have been explaining
you could not have been explaining
they could not have been explaining	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I explain?
could you explain?
could she explain?
could we explain?
could you explain?
could they explain? 	could I be explaining?
could you be explaining?
could she be explaining?
could we be explaining?
could you be explaining?
could they be explaining? 	could I have explained?
could you have explained?
could she have explained?
could we have explained?
could you have explained?
could they have explained? 	could I have been explaining?
could you have been explaining?
could she have been explaining?
could we have been explaining?
could you have been explaining?
could they have been explaining? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not explain?
could you not explain?
could she not explain?
could we not explain?
could you not explain?
could they not explain? 	could I not be explaining?
could you not be explaining?
could she not be explaining?
could we not be explaining?
could you not be explaining?
could they not be explaining? 	could I not have explained?
could you not have explained?
could she not have explained?
could we not have explained?
could you not have explained?
could they not have explained? 	could I not have been explaining?
could you not have been explaining?
could she not have been explaining?
could we not have been explaining?
could you not have been explaining?
could they not have been explaining?