must backfit
Verbe irrégulier : backfit - backfit, backfitted- backfit, backfitted

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must backfit
you must backfit
she must backfit
we must backfit
you must backfit
they must backfit 	I must be backfiting
you must be backfiting
she must be backfiting
we must be backfiting
you must be backfiting
they must be backfiting	I must have backfit, backfitted
you must have backfit, backfitted
she must have backfit, backfitted
we must have backfit, backfitted
you must have backfit, backfitted
they must have backfit, backfitted	I must have been backfiting
you must have been backfiting
she must have been backfiting
we must have been backfiting
you must have been backfiting
they must have been backfiting	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't backfit
you mustn't backfit
she mustn't backfit
we mustn't backfit
you mustn't backfit
they mustn't backfit 	I mustn't be backfiting
you mustn't be backfiting
she mustn't be backfiting
we mustn't be backfiting
you mustn't be backfiting
they mustn't be backfiting	I mustn't have backfit, backfitted
you mustn't have backfit, backfitted
she mustn't have backfit, backfitted
we mustn't have backfit, backfitted
you mustn't have backfit, backfitted
they mustn't have backfit, backfitted	I mustn't have been backfiting
you mustn't have been backfiting
she mustn't have been backfiting
we mustn't have been backfiting
you mustn't have been backfiting
they mustn't have been backfiting	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I backfit?
must you backfit?
must she backfit?
must we backfit?
must you backfit?
must they backfit? 	must I be backfiting?
must you be backfiting?
must she be backfiting?
must we be backfiting?
must you be backfiting?
must they be backfiting? 	must I have backfit, backfitted?
must you have backfit, backfitted?
must she have backfit, backfitted?
must we have backfit, backfitted?
must you have backfit, backfitted?
must they have backfit, backfitted? 	must I have been backfiting?
must you have been backfiting?
must she have been backfiting?
must we have been backfiting?
must you have been backfiting?
must they have been backfiting? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I backfit?
mustn't you backfit?
mustn't she backfit?
mustn't we backfit?
mustn't you backfit?
mustn't they backfit? 	mustn't I be backfiting?
mustn't you be backfiting?
mustn't she be backfiting?
mustn't we be backfiting?
mustn't you be backfiting?
mustn't they be backfiting? 	mustn't I have backfit, backfitted?
mustn't you have backfit, backfitted?
mustn't she have backfit, backfitted?
mustn't we have backfit, backfitted?
mustn't you have backfit, backfitted?
mustn't they have backfit, backfitted? 	mustn't I have been backfiting?
mustn't you have been backfiting?
mustn't she have been backfiting?
mustn't we have been backfiting?
mustn't you have been backfiting?
mustn't they have been backfiting?