English verb conjugation
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Regular verb: crook - crooked - crooked

Affirmation

Simple form	V-ing form
I must crook you must crook she must crook we must crook you must crook they must crook	I must be crooking you must be crooking she 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 she 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 she 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 mustn't crook you mustn't crook she mustn't crook we mustn't crook you mustn't crook they mustn't crook	I mustn't be crooking you mustn't be crooking she mustn't be crooking we mustn't be crooking you mustn't be crooking they mustn't be crooking
Perfect	V-ing perfect
I mustn't have crooked you mustn't have crooked she mustn't have crooked we mustn't have crooked you mustn't have crooked they mustn't have crooked	I mustn't have been crooking you mustn't have been crooking she mustn't have been crooking we mustn't have been crooking you mustn't have been crooking they mustn't have been crooking

Interrogative form

Simple form	V-ing form
must I crook? must you crook? must she crook? must we crook? must you crook? must they crook?	must I be crooking? must you be crooking? must she 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 she 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 she 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
mustn't I crook? mustn't you crook? mustn't she crook? mustn't we crook? mustn't you crook? mustn't they crook?	mustn't I be crooking? mustn't you be crooking? mustn't she be crooking? mustn't we be crooking? mustn't you be crooking? mustn't they be crooking?
Perfect	V-ing perfect
mustn't I have crooked? mustn't you have crooked? mustn't she have crooked? mustn't we have crooked? mustn't you have crooked? mustn't they have crooked?	mustn't I have been crooking? mustn't you have been crooking? mustn't she have been crooking? mustn't we have been crooking? mustn't you have been crooking? mustn't they have been crooking?