must pioneer
Verbe régulier : pioneer - pioneered- pioneered
Traduction française : être à l'avant garde de quelque chose 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
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	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't pioneer
you mustn't pioneer
she 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
she 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
she 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
she mustn't have been pioneering
we mustn't have been pioneering
you mustn't have been pioneering
they mustn't have been pioneering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
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? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I pioneer?
mustn't you pioneer?
mustn't she 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 she 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 she 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 she have been pioneering?
mustn't we have been pioneering?
mustn't you have been pioneering?
mustn't they have been pioneering?