I can screw you can screw he can screw we can screw you can screw they can screw
V-ing form
I can be screwing you can be screwing he can be screwing we can be screwing you can be screwing they can be screwing
Perfect
I can have screwed you can have screwed he can have screwed we can have screwed you can have screwed they can have screwed
V-ing perfect
I can have been screwing you can have been screwing he can have been screwing we can have been screwing you can have been screwing they can have been screwing
Negation
Simple form
I cannot screw you cannot screw he cannot screw we cannot screw you cannot screw they cannot screw
V-ing form
I cannot be screwing you cannot be screwing he cannot be screwing we cannot be screwing you cannot be screwing they cannot be screwing
Perfect
I cannot have screwed you cannot have screwed he cannot have screwed we cannot have screwed you cannot have screwed they cannot have screwed
V-ing perfect
I cannot have been screwing you cannot have been screwing he cannot have been screwing we cannot have been screwing you cannot have been screwing they cannot have been screwing
Interrogative form
Simple form
can I screw? can you screw? can he screw? can we screw? can you screw? can they screw?
V-ing form
can I be screwing? can you be screwing? can he be screwing? can we be screwing? can you be screwing? can they be screwing?
Perfect
can I have screwed? can you have screwed? can he have screwed? can we have screwed? can you have screwed? can they have screwed?
V-ing perfect
can I have been screwing? can you have been screwing? can he have been screwing? can we have been screwing? can you have been screwing? can they have been screwing?
Interro-negative form
Simple form
can I not screw? can you not screw? can he not screw? can we not screw? can you not screw? can they not screw?
V-ing form
can I not be screwing? can you not be screwing? can he not be screwing? can we not be screwing? can you not be screwing? can they not be screwing?
Perfect
can I not have screwed? can you not have screwed? can he not have screwed? can we not have screwed? can you not have screwed? can they not have screwed?
V-ing perfect
can I not have been screwing? can you not have been screwing? can he not have been screwing? can we not have been screwing? can you not have been screwing? can they not have been screwing?