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
he must labour
we must labour
you must labour
they must labour 	I must be labouring
you must be labouring
he must be labouring
we must be labouring
you must be labouring
they must be labouring	I must have laboured
you must have laboured
he 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
he 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 must not labour
you must not labour
he must not labour
we must not labour
you must not labour
they must not labour 	I must not be labouring
you must not be labouring
he must not be labouring
we must not be labouring
you must not be labouring
they must not be labouring	I must not have laboured
you must not have laboured
he must not have laboured
we must not have laboured
you must not have laboured
they must not have laboured	I must not have been labouring
you must not have been labouring
he must not have been labouring
we must not have been labouring
you must not have been labouring
they must not have been labouring	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I labour?
must you labour?
must he labour?
must we labour?
must you labour?
must they labour? 	must I be labouring?
must you be labouring?
must he be labouring?
must we be labouring?
must you be labouring?
must they be labouring? 	must I have laboured?
must you have laboured?
must he 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 he 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 	
must I not labour?
must you not labour?
must he not labour?
must we not labour?
must you not labour?
must they not labour? 	must I not be labouring?
must you not be labouring?
must he not be labouring?
must we not be labouring?
must you not be labouring?
must they not be labouring? 	must I not have laboured?
must you not have laboured?
must he not have laboured?
must we not have laboured?
must you not have laboured?
must they not have laboured? 	must I not have been labouring?
must you not have been labouring?
must he not have been labouring?
must we not have been labouring?
must you not have been labouring?
must they not have been labouring?