must concoct
Regular verb: concoct - concocted- concocted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must concoct
you must concoct
he must concoct
we must concoct
you must concoct
they must concoct 	I must be concocting
you must be concocting
he must be concocting
we must be concocting
you must be concocting
they must be concocting	I must have concocted
you must have concocted
he must have concocted
we must have concocted
you must have concocted
they must have concocted	I must have been concocting
you must have been concocting
he must have been concocting
we must have been concocting
you must have been concocting
they must have been concocting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't concoct
you mustn't concoct
he mustn't concoct
we mustn't concoct
you mustn't concoct
they mustn't concoct 	I mustn't be concocting
you mustn't be concocting
he mustn't be concocting
we mustn't be concocting
you mustn't be concocting
they mustn't be concocting	I mustn't have concocted
you mustn't have concocted
he mustn't have concocted
we mustn't have concocted
you mustn't have concocted
they mustn't have concocted	I mustn't have been concocting
you mustn't have been concocting
he mustn't have been concocting
we mustn't have been concocting
you mustn't have been concocting
they mustn't have been concocting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I concoct?
must you concoct?
must he concoct?
must we concoct?
must you concoct?
must they concoct? 	must I be concocting?
must you be concocting?
must he be concocting?
must we be concocting?
must you be concocting?
must they be concocting? 	must I have concocted?
must you have concocted?
must he have concocted?
must we have concocted?
must you have concocted?
must they have concocted? 	must I have been concocting?
must you have been concocting?
must he have been concocting?
must we have been concocting?
must you have been concocting?
must they have been concocting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I concoct?
mustn't you concoct?
mustn't he concoct?
mustn't we concoct?
mustn't you concoct?
mustn't they concoct? 	mustn't I be concocting?
mustn't you be concocting?
mustn't he be concocting?
mustn't we be concocting?
mustn't you be concocting?
mustn't they be concocting? 	mustn't I have concocted?
mustn't you have concocted?
mustn't he have concocted?
mustn't we have concocted?
mustn't you have concocted?
mustn't they have concocted? 	mustn't I have been concocting?
mustn't you have been concocting?
mustn't he have been concocting?
mustn't we have been concocting?
mustn't you have been concocting?
mustn't they have been concocting?