could pen
Verbo regular: pen - penned- penned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could pen
you could pen
he could pen
we could pen
you could pen
they could pen 	I could be penning
you could be penning
he could be penning
we could be penning
you could be penning
they could be penning	I could have penned
you could have penned
he could have penned
we could have penned
you could have penned
they could have penned	I could have been penning
you could have been penning
he could have been penning
we could have been penning
you could have been penning
they could have been penning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not pen
you could not pen
he could not pen
we could not pen
you could not pen
they could not pen 	I could not be penning
you could not be penning
he could not be penning
we could not be penning
you could not be penning
they could not be penning	I could not have penned
you could not have penned
he could not have penned
we could not have penned
you could not have penned
they could not have penned	I could not have been penning
you could not have been penning
he could not have been penning
we could not have been penning
you could not have been penning
they could not have been penning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I pen?
could you pen?
could he pen?
could we pen?
could you pen?
could they pen? 	could I be penning?
could you be penning?
could he be penning?
could we be penning?
could you be penning?
could they be penning? 	could I have penned?
could you have penned?
could he have penned?
could we have penned?
could you have penned?
could they have penned? 	could I have been penning?
could you have been penning?
could he have been penning?
could we have been penning?
could you have been penning?
could they have been penning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not pen?
could you not pen?
could he not pen?
could we not pen?
could you not pen?
could they not pen? 	could I not be penning?
could you not be penning?
could he not be penning?
could we not be penning?
could you not be penning?
could they not be penning? 	could I not have penned?
could you not have penned?
could he not have penned?
could we not have penned?
could you not have penned?
could they not have penned? 	could I not have been penning?
could you not have been penning?
could he not have been penning?
could we not have been penning?
could you not have been penning?
could they not have been penning?