must pioneer
Regular verb: pioneer - pioneered- pioneered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pioneer
you must pioneer
she must pioneer
we must pioneer
you must pioneer
they must pioneer 	I must be pioneering
you must be pioneering
she must be pioneering
we must be pioneering
you must be pioneering
they must be pioneering	I must have pioneered
you must have pioneered
she 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
she 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 must not pioneer
you must not pioneer
she must not pioneer
we must not pioneer
you must not pioneer
they must not pioneer 	I must not be pioneering
you must not be pioneering
she must not be pioneering
we must not be pioneering
you must not be pioneering
they must not be pioneering	I must not have pioneered
you must not have pioneered
she must not have pioneered
we must not have pioneered
you must not have pioneered
they must not have pioneered	I must not have been pioneering
you must not have been pioneering
she must not have been pioneering
we must not have been pioneering
you must not have been pioneering
they must not have been pioneering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pioneer?
must you pioneer?
must she pioneer?
must we pioneer?
must you pioneer?
must they pioneer? 	must I be pioneering?
must you be pioneering?
must she be pioneering?
must we be pioneering?
must you be pioneering?
must they be pioneering? 	must I have pioneered?
must you have pioneered?
must she 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 she 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 	
must I not pioneer?
must you not pioneer?
must she not pioneer?
must we not pioneer?
must you not pioneer?
must they not pioneer? 	must I not be pioneering?
must you not be pioneering?
must she not be pioneering?
must we not be pioneering?
must you not be pioneering?
must they not be pioneering? 	must I not have pioneered?
must you not have pioneered?
must she not have pioneered?
must we not have pioneered?
must you not have pioneered?
must they not have pioneered? 	must I not have been pioneering?
must you not have been pioneering?
must she not have been pioneering?
must we not have been pioneering?
must you not have been pioneering?
must they not have been pioneering?