must pioneer
Regular verb: pioneer - pioneered- pioneered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pioneer
you must pioneer
he must pioneer
we must pioneer
you must pioneer
they must pioneer 	I must be pioneering
you must be pioneering
he must be pioneering
we must be pioneering
you must be pioneering
they must be pioneering	I must have pioneered
you must have pioneered
he must have pioneered
we must have pioneered
you must have pioneered
they must have pioneered	I must have been pioneering
you must have been pioneering
he must have been pioneering
we must have been pioneering
you must have been pioneering
they must have been pioneering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't pioneer
you mustn't pioneer
he mustn't pioneer
we mustn't pioneer
you mustn't pioneer
they mustn't pioneer 	I mustn't be pioneering
you mustn't be pioneering
he mustn't be pioneering
we mustn't be pioneering
you mustn't be pioneering
they mustn't be pioneering	I mustn't have pioneered
you mustn't have pioneered
he mustn't have pioneered
we mustn't have pioneered
you mustn't have pioneered
they mustn't have pioneered	I mustn't have been pioneering
you mustn't have been pioneering
he mustn't have been pioneering
we mustn't have been pioneering
you mustn't have been pioneering
they mustn't have been pioneering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pioneer?
must you pioneer?
must he pioneer?
must we pioneer?
must you pioneer?
must they pioneer? 	must I be pioneering?
must you be pioneering?
must he be pioneering?
must we be pioneering?
must you be pioneering?
must they be pioneering? 	must I have pioneered?
must you have pioneered?
must he have pioneered?
must we have pioneered?
must you have pioneered?
must they have pioneered? 	must I have been pioneering?
must you have been pioneering?
must he have been pioneering?
must we have been pioneering?
must you have been pioneering?
must they have been pioneering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I pioneer?
mustn't you pioneer?
mustn't he pioneer?
mustn't we pioneer?
mustn't you pioneer?
mustn't they pioneer? 	mustn't I be pioneering?
mustn't you be pioneering?
mustn't he be pioneering?
mustn't we be pioneering?
mustn't you be pioneering?
mustn't they be pioneering? 	mustn't I have pioneered?
mustn't you have pioneered?
mustn't he have pioneered?
mustn't we have pioneered?
mustn't you have pioneered?
mustn't they have pioneered? 	mustn't I have been pioneering?
mustn't you have been pioneering?
mustn't he have been pioneering?
mustn't we have been pioneering?
mustn't you have been pioneering?
mustn't they have been pioneering?