I can crook you can crook he can crook we can crook you can crook they can crook
V-ing form
I can be crooking you can be crooking he can be crooking we can be crooking you can be crooking they can be crooking
Perfect
I can have crooked you can have crooked he can have crooked we can have crooked you can have crooked they can have crooked
V-ing perfect
I can have been crooking you can have been crooking he can have been crooking we can have been crooking you can have been crooking they can have been crooking
Negation
Simple form
I can't crook you can't crook he can't crook we can't crook you can't crook they can't crook
V-ing form
I can't be crooking you can't be crooking he can't be crooking we can't be crooking you can't be crooking they can't be crooking
Perfect
I can't have crooked you can't have crooked he can't have crooked we can't have crooked you can't have crooked they can't have crooked
V-ing perfect
I can't have been crooking you can't have been crooking he can't have been crooking we can't have been crooking you can't have been crooking they can't have been crooking
Interrogative form
Simple form
can I crook? can you crook? can he crook? can we crook? can you crook? can they crook?
V-ing form
can I be crooking? can you be crooking? can he be crooking? can we be crooking? can you be crooking? can they be crooking?
Perfect
can I have crooked? can you have crooked? can he have crooked? can we have crooked? can you have crooked? can they have crooked?
V-ing perfect
can I have been crooking? can you have been crooking? can he have been crooking? can we have been crooking? can you have been crooking? can they have been crooking?
Interro-negative form
Simple form
can't I crook? can't you crook? can't he crook? can't we crook? can't you crook? can't they crook?
V-ing form
can't I be crooking? can't you be crooking? can't he be crooking? can't we be crooking? can't you be crooking? can't they be crooking?
Perfect
can't I have crooked? can't you have crooked? can't he have crooked? can't we have crooked? can't you have crooked? can't they have crooked?
V-ing perfect
can't I have been crooking? can't you have been crooking? can't he have been crooking? can't we have been crooking? can't you have been crooking? can't they have been crooking?