must sprint
Regular verb: sprint - sprinted- sprinted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sprint
you must sprint
he must sprint
we must sprint
you must sprint
they must sprint 	I must be sprinting
you must be sprinting
he must be sprinting
we must be sprinting
you must be sprinting
they must be sprinting	I must have sprinted
you must have sprinted
he must have sprinted
we must have sprinted
you must have sprinted
they must have sprinted	I must have been sprinting
you must have been sprinting
he must have been sprinting
we must have been sprinting
you must have been sprinting
they must have been sprinting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sprint
you mustn't sprint
he mustn't sprint
we mustn't sprint
you mustn't sprint
they mustn't sprint 	I mustn't be sprinting
you mustn't be sprinting
he mustn't be sprinting
we mustn't be sprinting
you mustn't be sprinting
they mustn't be sprinting	I mustn't have sprinted
you mustn't have sprinted
he mustn't have sprinted
we mustn't have sprinted
you mustn't have sprinted
they mustn't have sprinted	I mustn't have been sprinting
you mustn't have been sprinting
he mustn't have been sprinting
we mustn't have been sprinting
you mustn't have been sprinting
they mustn't have been sprinting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sprint?
must you sprint?
must he sprint?
must we sprint?
must you sprint?
must they sprint? 	must I be sprinting?
must you be sprinting?
must he be sprinting?
must we be sprinting?
must you be sprinting?
must they be sprinting? 	must I have sprinted?
must you have sprinted?
must he have sprinted?
must we have sprinted?
must you have sprinted?
must they have sprinted? 	must I have been sprinting?
must you have been sprinting?
must he have been sprinting?
must we have been sprinting?
must you have been sprinting?
must they have been sprinting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sprint?
mustn't you sprint?
mustn't he sprint?
mustn't we sprint?
mustn't you sprint?
mustn't they sprint? 	mustn't I be sprinting?
mustn't you be sprinting?
mustn't he be sprinting?
mustn't we be sprinting?
mustn't you be sprinting?
mustn't they be sprinting? 	mustn't I have sprinted?
mustn't you have sprinted?
mustn't he have sprinted?
mustn't we have sprinted?
mustn't you have sprinted?
mustn't they have sprinted? 	mustn't I have been sprinting?
mustn't you have been sprinting?
mustn't he have been sprinting?
mustn't we have been sprinting?
mustn't you have been sprinting?
mustn't they have been sprinting?