must prick
Regular verb: prick - pricked- pricked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must prick
you must prick
he must prick
we must prick
you must prick
they must prick 	I must be pricking
you must be pricking
he must be pricking
we must be pricking
you must be pricking
they must be pricking	I must have pricked
you must have pricked
he must have pricked
we must have pricked
you must have pricked
they must have pricked	I must have been pricking
you must have been pricking
he must have been pricking
we must have been pricking
you must have been pricking
they must have been pricking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't prick
you mustn't prick
he mustn't prick
we mustn't prick
you mustn't prick
they mustn't prick 	I mustn't be pricking
you mustn't be pricking
he mustn't be pricking
we mustn't be pricking
you mustn't be pricking
they mustn't be pricking	I mustn't have pricked
you mustn't have pricked
he mustn't have pricked
we mustn't have pricked
you mustn't have pricked
they mustn't have pricked	I mustn't have been pricking
you mustn't have been pricking
he mustn't have been pricking
we mustn't have been pricking
you mustn't have been pricking
they mustn't have been pricking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I prick?
must you prick?
must he prick?
must we prick?
must you prick?
must they prick? 	must I be pricking?
must you be pricking?
must he be pricking?
must we be pricking?
must you be pricking?
must they be pricking? 	must I have pricked?
must you have pricked?
must he have pricked?
must we have pricked?
must you have pricked?
must they have pricked? 	must I have been pricking?
must you have been pricking?
must he have been pricking?
must we have been pricking?
must you have been pricking?
must they have been pricking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I prick?
mustn't you prick?
mustn't he prick?
mustn't we prick?
mustn't you prick?
mustn't they prick? 	mustn't I be pricking?
mustn't you be pricking?
mustn't he be pricking?
mustn't we be pricking?
mustn't you be pricking?
mustn't they be pricking? 	mustn't I have pricked?
mustn't you have pricked?
mustn't he have pricked?
mustn't we have pricked?
mustn't you have pricked?
mustn't they have pricked? 	mustn't I have been pricking?
mustn't you have been pricking?
mustn't he have been pricking?
mustn't we have been pricking?
mustn't you have been pricking?
mustn't they have been pricking?