could swallow
Verbo regular: swallow - swallowed- swallowed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could swallow
you could swallow
he could swallow
we could swallow
you could swallow
they could swallow 	I could be swallowing
you could be swallowing
he could be swallowing
we could be swallowing
you could be swallowing
they could be swallowing	I could have swallowed
you could have swallowed
he could have swallowed
we could have swallowed
you could have swallowed
they could have swallowed	I could have been swallowing
you could have been swallowing
he could have been swallowing
we could have been swallowing
you could have been swallowing
they could have been swallowing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not swallow
you could not swallow
he could not swallow
we could not swallow
you could not swallow
they could not swallow 	I could not be swallowing
you could not be swallowing
he could not be swallowing
we could not be swallowing
you could not be swallowing
they could not be swallowing	I could not have swallowed
you could not have swallowed
he could not have swallowed
we could not have swallowed
you could not have swallowed
they could not have swallowed	I could not have been swallowing
you could not have been swallowing
he could not have been swallowing
we could not have been swallowing
you could not have been swallowing
they could not have been swallowing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I swallow?
could you swallow?
could he swallow?
could we swallow?
could you swallow?
could they swallow? 	could I be swallowing?
could you be swallowing?
could he be swallowing?
could we be swallowing?
could you be swallowing?
could they be swallowing? 	could I have swallowed?
could you have swallowed?
could he have swallowed?
could we have swallowed?
could you have swallowed?
could they have swallowed? 	could I have been swallowing?
could you have been swallowing?
could he have been swallowing?
could we have been swallowing?
could you have been swallowing?
could they have been swallowing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not swallow?
could you not swallow?
could he not swallow?
could we not swallow?
could you not swallow?
could they not swallow? 	could I not be swallowing?
could you not be swallowing?
could he not be swallowing?
could we not be swallowing?
could you not be swallowing?
could they not be swallowing? 	could I not have swallowed?
could you not have swallowed?
could he not have swallowed?
could we not have swallowed?
could you not have swallowed?
could they not have swallowed? 	could I not have been swallowing?
could you not have been swallowing?
could he not have been swallowing?
could we not have been swallowing?
could you not have been swallowing?
could they not have been swallowing?