could limb
Regular verb: limb - limbed- limbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could limb
you could limb
she could limb
we could limb
you could limb
they could limb 	I could be limbing
you could be limbing
she could be limbing
we could be limbing
you could be limbing
they could be limbing	I could have limbed
you could have limbed
she could have limbed
we could have limbed
you could have limbed
they could have limbed	I could have been limbing
you could have been limbing
she could have been limbing
we could have been limbing
you could have been limbing
they could have been limbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't limb
you couldn't limb
she couldn't limb
we couldn't limb
you couldn't limb
they couldn't limb 	I couldn't be limbing
you couldn't be limbing
she couldn't be limbing
we couldn't be limbing
you couldn't be limbing
they couldn't be limbing	I couldn't have limbed
you couldn't have limbed
she couldn't have limbed
we couldn't have limbed
you couldn't have limbed
they couldn't have limbed	I couldn't have been limbing
you couldn't have been limbing
she couldn't have been limbing
we couldn't have been limbing
you couldn't have been limbing
they couldn't have been limbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I limb?
could you limb?
could she limb?
could we limb?
could you limb?
could they limb? 	could I be limbing?
could you be limbing?
could she be limbing?
could we be limbing?
could you be limbing?
could they be limbing? 	could I have limbed?
could you have limbed?
could she have limbed?
could we have limbed?
could you have limbed?
could they have limbed? 	could I have been limbing?
could you have been limbing?
could she have been limbing?
could we have been limbing?
could you have been limbing?
could they have been limbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I limb?
couldn't you limb?
couldn't she limb?
couldn't we limb?
couldn't you limb?
couldn't they limb? 	couldn't I be limbing?
couldn't you be limbing?
couldn't she be limbing?
couldn't we be limbing?
couldn't you be limbing?
couldn't they be limbing? 	couldn't I have limbed?
couldn't you have limbed?
couldn't she have limbed?
couldn't we have limbed?
couldn't you have limbed?
couldn't they have limbed? 	couldn't I have been limbing?
couldn't you have been limbing?
couldn't she have been limbing?
couldn't we have been limbing?
couldn't you have been limbing?
couldn't they have been limbing?