must lag
Verbe régulier : lag - lagged- lagged
Traduction française : rester en arrière - calori-fuger 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must lag
you must lag
she must lag
we must lag
you must lag
they must lag 	I must be lagging
you must be lagging
she must be lagging
we must be lagging
you must be lagging
they must be lagging	I must have lagged
you must have lagged
she must have lagged
we must have lagged
you must have lagged
they must have lagged	I must have been lagging
you must have been lagging
she must have been lagging
we must have been lagging
you must have been lagging
they must have been lagging	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't lag
you mustn't lag
she mustn't lag
we mustn't lag
you mustn't lag
they mustn't lag 	I mustn't be lagging
you mustn't be lagging
she mustn't be lagging
we mustn't be lagging
you mustn't be lagging
they mustn't be lagging	I mustn't have lagged
you mustn't have lagged
she mustn't have lagged
we mustn't have lagged
you mustn't have lagged
they mustn't have lagged	I mustn't have been lagging
you mustn't have been lagging
she mustn't have been lagging
we mustn't have been lagging
you mustn't have been lagging
they mustn't have been lagging	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I lag?
must you lag?
must she lag?
must we lag?
must you lag?
must they lag? 	must I be lagging?
must you be lagging?
must she be lagging?
must we be lagging?
must you be lagging?
must they be lagging? 	must I have lagged?
must you have lagged?
must she have lagged?
must we have lagged?
must you have lagged?
must they have lagged? 	must I have been lagging?
must you have been lagging?
must she have been lagging?
must we have been lagging?
must you have been lagging?
must they have been lagging? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I lag?
mustn't you lag?
mustn't she lag?
mustn't we lag?
mustn't you lag?
mustn't they lag? 	mustn't I be lagging?
mustn't you be lagging?
mustn't she be lagging?
mustn't we be lagging?
mustn't you be lagging?
mustn't they be lagging? 	mustn't I have lagged?
mustn't you have lagged?
mustn't she have lagged?
mustn't we have lagged?
mustn't you have lagged?
mustn't they have lagged? 	mustn't I have been lagging?
mustn't you have been lagging?
mustn't she have been lagging?
mustn't we have been lagging?
mustn't you have been lagging?
mustn't they have been lagging?