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 cannot crook you cannot crook she cannot crook we cannot crook you cannot crook they cannot crook
V-ing form
I cannot be crooking you cannot be crooking she cannot be crooking we cannot be crooking you cannot be crooking they cannot be crooking
Perfect
I cannot have crooked you cannot have crooked she cannot have crooked we cannot have crooked you cannot have crooked they cannot have crooked
V-ing perfect
I cannot have been crooking you cannot have been crooking she cannot have been crooking we cannot have been crooking you cannot have been crooking they cannot 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 I not crook? can you not crook? can she not crook? can we not crook? can you not crook? can they not crook?
V-ing form
can I not be crooking? can you not be crooking? can she not be crooking? can we not be crooking? can you not be crooking? can they not be crooking?
Perfect
can I not have crooked? can you not have crooked? can she not have crooked? can we not have crooked? can you not have crooked? can they not have crooked?
V-ing perfect
can I not have been crooking? can you not have been crooking? can she not have been crooking? can we not have been crooking? can you not have been crooking? can they not have been crooking?