I can crook you can crook she can crook we can crook you can crook they can crook
V-ing form
I can be crooking you can be crooking she can be crooking we can be crooking you can be crooking they can be crooking
Perfect
I can have crooked you can have crooked she 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 she 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 she 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 she 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 she 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 she 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 she crook? can we crook? can you crook? can they crook?
V-ing form
can I be crooking? can you be crooking? can she be crooking? can we be crooking? can you be crooking? can they be crooking?
Perfect
can I have crooked? can you have crooked? can she 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 she 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 she 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 she 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 she 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 she have been crooking? can't we have been crooking? can't you have been crooking? can't they have been crooking?