could open
Verbo regolare: open - opened- opened

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could open
you could open
he could open
we could open
you could open
they could open 	I could be opening
you could be opening
he could be opening
we could be opening
you could be opening
they could be opening	I could have opened
you could have opened
he could have opened
we could have opened
you could have opened
they could have opened	I could have been opening
you could have been opening
he could have been opening
we could have been opening
you could have been opening
they could have been opening	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not open
you could not open
he could not open
we could not open
you could not open
they could not open 	I could not be opening
you could not be opening
he could not be opening
we could not be opening
you could not be opening
they could not be opening	I could not have opened
you could not have opened
he could not have opened
we could not have opened
you could not have opened
they could not have opened	I could not have been opening
you could not have been opening
he could not have been opening
we could not have been opening
you could not have been opening
they could not have been opening	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I open?
could you open?
could he open?
could we open?
could you open?
could they open? 	could I be opening?
could you be opening?
could he be opening?
could we be opening?
could you be opening?
could they be opening? 	could I have opened?
could you have opened?
could he have opened?
could we have opened?
could you have opened?
could they have opened? 	could I have been opening?
could you have been opening?
could he have been opening?
could we have been opening?
could you have been opening?
could they have been opening? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not open?
could you not open?
could he not open?
could we not open?
could you not open?
could they not open? 	could I not be opening?
could you not be opening?
could he not be opening?
could we not be opening?
could you not be opening?
could they not be opening? 	could I not have opened?
could you not have opened?
could he not have opened?
could we not have opened?
could you not have opened?
could they not have opened? 	could I not have been opening?
could you not have been opening?
could he not have been opening?
could we not have been opening?
could you not have been opening?
could they not have been opening?