must labor
Verbe régulier : labor - labored- labored
Traduction française : (US) travailler dur - insister sur 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must labor
you must labor
he must labor
we must labor
you must labor
they must labor 	I must be laboring
you must be laboring
he must be laboring
we must be laboring
you must be laboring
they must be laboring	I must have labored
you must have labored
he must have labored
we must have labored
you must have labored
they must have labored	I must have been laboring
you must have been laboring
he must have been laboring
we must have been laboring
you must have been laboring
they must have been laboring	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not labor
you must not labor
he must not labor
we must not labor
you must not labor
they must not labor 	I must not be laboring
you must not be laboring
he must not be laboring
we must not be laboring
you must not be laboring
they must not be laboring	I must not have labored
you must not have labored
he must not have labored
we must not have labored
you must not have labored
they must not have labored	I must not have been laboring
you must not have been laboring
he must not have been laboring
we must not have been laboring
you must not have been laboring
they must not have been laboring	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I labor?
must you labor?
must he labor?
must we labor?
must you labor?
must they labor? 	must I be laboring?
must you be laboring?
must he be laboring?
must we be laboring?
must you be laboring?
must they be laboring? 	must I have labored?
must you have labored?
must he have labored?
must we have labored?
must you have labored?
must they have labored? 	must I have been laboring?
must you have been laboring?
must he have been laboring?
must we have been laboring?
must you have been laboring?
must they have been laboring? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not labor?
must you not labor?
must he not labor?
must we not labor?
must you not labor?
must they not labor? 	must I not be laboring?
must you not be laboring?
must he not be laboring?
must we not be laboring?
must you not be laboring?
must they not be laboring? 	must I not have labored?
must you not have labored?
must he not have labored?
must we not have labored?
must you not have labored?
must they not have labored? 	must I not have been laboring?
must you not have been laboring?
must he not have been laboring?
must we not have been laboring?
must you not have been laboring?
must they not have been laboring?