must crook
Regular verb: crook - crooked- crooked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?