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 couldn't labor
you couldn't labor
he couldn't labor
we couldn't labor
you couldn't labor
they couldn't labor 	I couldn't be laboring
you couldn't be laboring
he couldn't be laboring
we couldn't be laboring
you couldn't be laboring
they couldn't be laboring	I couldn't have labored
you couldn't have labored
he couldn't have labored
we couldn't have labored
you couldn't have labored
they couldn't have labored	I couldn't have been laboring
you couldn't have been laboring
he couldn't have been laboring
we couldn't have been laboring
you couldn't have been laboring
they couldn't 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 	
couldn't I labor?
couldn't you labor?
couldn't he labor?
couldn't we labor?
couldn't you labor?
couldn't they labor? 	couldn't I be laboring?
couldn't you be laboring?
couldn't he be laboring?
couldn't we be laboring?
couldn't you be laboring?
couldn't they be laboring? 	couldn't I have labored?
couldn't you have labored?
couldn't he have labored?
couldn't we have labored?
couldn't you have labored?
couldn't they have labored? 	couldn't I have been laboring?
couldn't you have been laboring?
couldn't he have been laboring?
couldn't we have been laboring?
couldn't you have been laboring?
couldn't they have been laboring?