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