could screw
Verbo regular: screw - screwed- screwed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't screw
you couldn't screw
he couldn't screw
we couldn't screw
you couldn't screw
they couldn't screw 	I couldn't be screwing
you couldn't be screwing
he couldn't be screwing
we couldn't be screwing
you couldn't be screwing
they couldn't be screwing	I couldn't have screwed
you couldn't have screwed
he couldn't have screwed
we couldn't have screwed
you couldn't have screwed
they couldn't have screwed	I couldn't have been screwing
you couldn't have been screwing
he couldn't have been screwing
we couldn't have been screwing
you couldn't have been screwing
they couldn't have been screwing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I screw?
couldn't you screw?
couldn't he screw?
couldn't we screw?
couldn't you screw?
couldn't they screw? 	couldn't I be screwing?
couldn't you be screwing?
couldn't he be screwing?
couldn't we be screwing?
couldn't you be screwing?
couldn't they be screwing? 	couldn't I have screwed?
couldn't you have screwed?
couldn't he have screwed?
couldn't we have screwed?
couldn't you have screwed?
couldn't they have screwed? 	couldn't I have been screwing?
couldn't you have been screwing?
couldn't he have been screwing?
couldn't we have been screwing?
couldn't you have been screwing?
couldn't they have been screwing?