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 can't screw you can't screw he can't screw we can't screw you can't screw they can't screw
V-ing form
I can't be screwing you can't be screwing he can't be screwing we can't be screwing you can't be screwing they can't be screwing
Perfect
I can't have screwed you can't have screwed he can't have screwed we can't have screwed you can't have screwed they can't have screwed
V-ing perfect
I can't have been screwing you can't have been screwing he can't have been screwing we can't have been screwing you can't have been screwing they can't 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't I screw? can't you screw? can't he screw? can't we screw? can't you screw? can't they screw?
V-ing form
can't I be screwing? can't you be screwing? can't he be screwing? can't we be screwing? can't you be screwing? can't they be screwing?
Perfect
can't I have screwed? can't you have screwed? can't he have screwed? can't we have screwed? can't you have screwed? can't they have screwed?
V-ing perfect
can't I have been screwing? can't you have been screwing? can't he have been screwing? can't we have been screwing? can't you have been screwing? can't they have been screwing?