must labour
Verbe régulier : labour - laboured- laboured
Traduction française : (UK) travailler dur - insister sur 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must labour
you must labour
she must labour
we must labour
you must labour
they must labour 	I must be labouring
you must be labouring
she must be labouring
we must be labouring
you must be labouring
they must be labouring	I must have laboured
you must have laboured
she must have laboured
we must have laboured
you must have laboured
they must have laboured	I must have been labouring
you must have been labouring
she must have been labouring
we must have been labouring
you must have been labouring
they must have been labouring	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't labour
you mustn't labour
she mustn't labour
we mustn't labour
you mustn't labour
they mustn't labour 	I mustn't be labouring
you mustn't be labouring
she mustn't be labouring
we mustn't be labouring
you mustn't be labouring
they mustn't be labouring	I mustn't have laboured
you mustn't have laboured
she mustn't have laboured
we mustn't have laboured
you mustn't have laboured
they mustn't have laboured	I mustn't have been labouring
you mustn't have been labouring
she mustn't have been labouring
we mustn't have been labouring
you mustn't have been labouring
they mustn't have been labouring	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I labour?
must you labour?
must she labour?
must we labour?
must you labour?
must they labour? 	must I be labouring?
must you be labouring?
must she be labouring?
must we be labouring?
must you be labouring?
must they be labouring? 	must I have laboured?
must you have laboured?
must she have laboured?
must we have laboured?
must you have laboured?
must they have laboured? 	must I have been labouring?
must you have been labouring?
must she have been labouring?
must we have been labouring?
must you have been labouring?
must they have been labouring? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I labour?
mustn't you labour?
mustn't she labour?
mustn't we labour?
mustn't you labour?
mustn't they labour? 	mustn't I be labouring?
mustn't you be labouring?
mustn't she be labouring?
mustn't we be labouring?
mustn't you be labouring?
mustn't they be labouring? 	mustn't I have laboured?
mustn't you have laboured?
mustn't she have laboured?
mustn't we have laboured?
mustn't you have laboured?
mustn't they have laboured? 	mustn't I have been labouring?
mustn't you have been labouring?
mustn't she have been labouring?
mustn't we have been labouring?
mustn't you have been labouring?
mustn't they have been labouring?