could screw
Verbo regular: screw - screwed- screwed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could screw
you could screw
he could screw
we could screw
you could screw
they could screw 	I could be screwing
you could be screwing
he could be screwing
we could be screwing
you could be screwing
they could be screwing	I could have screwed
you could have screwed
he could have screwed
we could have screwed
you could have screwed
they could have screwed	I could have been screwing
you could have been screwing
he could have been screwing
we could have been screwing
you could have been screwing
they could have been screwing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not screw
you could not screw
he could not screw
we could not screw
you could not screw
they could not screw 	I could not be screwing
you could not be screwing
he could not be screwing
we could not be screwing
you could not be screwing
they could not be screwing	I could not have screwed
you could not have screwed
he could not have screwed
we could not have screwed
you could not have screwed
they could not have screwed	I could not have been screwing
you could not have been screwing
he could not have been screwing
we could not have been screwing
you could not have been screwing
they could not have been screwing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I screw?
could you screw?
could he screw?
could we screw?
could you screw?
could they screw? 	could I be screwing?
could you be screwing?
could he be screwing?
could we be screwing?
could you be screwing?
could they be screwing? 	could I have screwed?
could you have screwed?
could he have screwed?
could we have screwed?
could you have screwed?
could they have screwed? 	could I have been screwing?
could you have been screwing?
could he have been screwing?
could we have been screwing?
could you have been screwing?
could they have been screwing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not screw?
could you not screw?
could he not screw?
could we not screw?
could you not screw?
could they not screw? 	could I not be screwing?
could you not be screwing?
could he not be screwing?
could we not be screwing?
could you not be screwing?
could they not be screwing? 	could I not have screwed?
could you not have screwed?
could he not have screwed?
could we not have screwed?
could you not have screwed?
could they not have screwed? 	could I not have been screwing?
could you not have been screwing?
could he not have been screwing?
could we not have been screwing?
could you not have been screwing?
could they not have been screwing?