could complain
Verbo regular: complain - complained- complained

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could complain
you could complain
he could complain
we could complain
you could complain
they could complain 	I could be complaining
you could be complaining
he could be complaining
we could be complaining
you could be complaining
they could be complaining	I could have complained
you could have complained
he could have complained
we could have complained
you could have complained
they could have complained	I could have been complaining
you could have been complaining
he could have been complaining
we could have been complaining
you could have been complaining
they could have been complaining	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not complain
you could not complain
he could not complain
we could not complain
you could not complain
they could not complain 	I could not be complaining
you could not be complaining
he could not be complaining
we could not be complaining
you could not be complaining
they could not be complaining	I could not have complained
you could not have complained
he could not have complained
we could not have complained
you could not have complained
they could not have complained	I could not have been complaining
you could not have been complaining
he could not have been complaining
we could not have been complaining
you could not have been complaining
they could not have been complaining	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I complain?
could you complain?
could he complain?
could we complain?
could you complain?
could they complain? 	could I be complaining?
could you be complaining?
could he be complaining?
could we be complaining?
could you be complaining?
could they be complaining? 	could I have complained?
could you have complained?
could he have complained?
could we have complained?
could you have complained?
could they have complained? 	could I have been complaining?
could you have been complaining?
could he have been complaining?
could we have been complaining?
could you have been complaining?
could they have been complaining? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not complain?
could you not complain?
could he not complain?
could we not complain?
could you not complain?
could they not complain? 	could I not be complaining?
could you not be complaining?
could he not be complaining?
could we not be complaining?
could you not be complaining?
could they not be complaining? 	could I not have complained?
could you not have complained?
could he not have complained?
could we not have complained?
could you not have complained?
could they not have complained? 	could I not have been complaining?
could you not have been complaining?
could he not have been complaining?
could we not have been complaining?
could you not have been complaining?
could they not have been complaining?