English verb conjugation
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Regular verb: crook - crooked - crooked

Affirmation

Simple form	V-ing form
I must crook you must crook he must crook we must crook you must crook they must crook	I must be crooking you must be crooking he must be crooking we must be crooking you must be crooking they must be crooking
Perfect	V-ing perfect
I must have crooked you must have crooked he must have crooked we must have crooked you must have crooked they must have crooked	I must have been crooking you must have been crooking he must have been crooking we must have been crooking you must have been crooking they must have been crooking

Negation

Simple form	V-ing form
I must not crook you must not crook he must not crook we must not crook you must not crook they must not crook	I must not be crooking you must not be crooking he must not be crooking we must not be crooking you must not be crooking they must not be crooking
Perfect	V-ing perfect
I must not have crooked you must not have crooked he must not have crooked we must not have crooked you must not have crooked they must not have crooked	I must not have been crooking you must not have been crooking he must not have been crooking we must not have been crooking you must not have been crooking they must not have been crooking

Interrogative form

Simple form	V-ing form
must I crook? must you crook? must he crook? must we crook? must you crook? must they crook?	must I be crooking? must you be crooking? must he be crooking? must we be crooking? must you be crooking? must they be crooking?
Perfect	V-ing perfect
must I have crooked? must you have crooked? must he have crooked? must we have crooked? must you have crooked? must they have crooked?	must I have been crooking? must you have been crooking? must he have been crooking? must we have been crooking? must you have been crooking? must they have been crooking?

Interro-negative form

Simple form	V-ing form
must I not crook? must you not crook? must he not crook? must we not crook? must you not crook? must they not crook?	must I not be crooking? must you not be crooking? must he not be crooking? must we not be crooking? must you not be crooking? must they not be crooking?
Perfect	V-ing perfect
must I not have crooked? must you not have crooked? must he not have crooked? must we not have crooked? must you not have crooked? must they not have crooked?	must I not have been crooking? must you not have been crooking? must he not have been crooking? must we not have been crooking? must you not have been crooking? must they not have been crooking?