could labor
Regular verb: labor - labored- labored

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could labor
you could labor
he could labor
we could labor
you could labor
they could labor 	I could be laboring
you could be laboring
he could be laboring
we could be laboring
you could be laboring
they could be laboring	I could have labored
you could have labored
he could have labored
we could have labored
you could have labored
they could have labored	I could have been laboring
you could have been laboring
he could have been laboring
we could have been laboring
you could have been laboring
they could have been laboring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not labor
you could not labor
he could not labor
we could not labor
you could not labor
they could not labor 	I could not be laboring
you could not be laboring
he could not be laboring
we could not be laboring
you could not be laboring
they could not be laboring	I could not have labored
you could not have labored
he could not have labored
we could not have labored
you could not have labored
they could not have labored	I could not have been laboring
you could not have been laboring
he could not have been laboring
we could not have been laboring
you could not have been laboring
they could not have been laboring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I labor?
could you labor?
could he labor?
could we labor?
could you labor?
could they labor? 	could I be laboring?
could you be laboring?
could he be laboring?
could we be laboring?
could you be laboring?
could they be laboring? 	could I have labored?
could you have labored?
could he have labored?
could we have labored?
could you have labored?
could they have labored? 	could I have been laboring?
could you have been laboring?
could he have been laboring?
could we have been laboring?
could you have been laboring?
could they have been laboring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not labor?
could you not labor?
could he not labor?
could we not labor?
could you not labor?
could they not labor? 	could I not be laboring?
could you not be laboring?
could he not be laboring?
could we not be laboring?
could you not be laboring?
could they not be laboring? 	could I not have labored?
could you not have labored?
could he not have labored?
could we not have labored?
could you not have labored?
could they not have labored? 	could I not have been laboring?
could you not have been laboring?
could he not have been laboring?
could we not have been laboring?
could you not have been laboring?
could they not have been laboring?