could scab
Regular verb: scab - scabbed- scabbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could scab
you could scab
he could scab
we could scab
you could scab
they could scab 	I could be scabbing
you could be scabbing
he could be scabbing
we could be scabbing
you could be scabbing
they could be scabbing	I could have scabbed
you could have scabbed
he could have scabbed
we could have scabbed
you could have scabbed
they could have scabbed	I could have been scabbing
you could have been scabbing
he could have been scabbing
we could have been scabbing
you could have been scabbing
they could have been scabbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't scab
you couldn't scab
he couldn't scab
we couldn't scab
you couldn't scab
they couldn't scab 	I couldn't be scabbing
you couldn't be scabbing
he couldn't be scabbing
we couldn't be scabbing
you couldn't be scabbing
they couldn't be scabbing	I couldn't have scabbed
you couldn't have scabbed
he couldn't have scabbed
we couldn't have scabbed
you couldn't have scabbed
they couldn't have scabbed	I couldn't have been scabbing
you couldn't have been scabbing
he couldn't have been scabbing
we couldn't have been scabbing
you couldn't have been scabbing
they couldn't have been scabbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I scab?
could you scab?
could he scab?
could we scab?
could you scab?
could they scab? 	could I be scabbing?
could you be scabbing?
could he be scabbing?
could we be scabbing?
could you be scabbing?
could they be scabbing? 	could I have scabbed?
could you have scabbed?
could he have scabbed?
could we have scabbed?
could you have scabbed?
could they have scabbed? 	could I have been scabbing?
could you have been scabbing?
could he have been scabbing?
could we have been scabbing?
could you have been scabbing?
could they have been scabbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I scab?
couldn't you scab?
couldn't he scab?
couldn't we scab?
couldn't you scab?
couldn't they scab? 	couldn't I be scabbing?
couldn't you be scabbing?
couldn't he be scabbing?
couldn't we be scabbing?
couldn't you be scabbing?
couldn't they be scabbing? 	couldn't I have scabbed?
couldn't you have scabbed?
couldn't he have scabbed?
couldn't we have scabbed?
couldn't you have scabbed?
couldn't they have scabbed? 	couldn't I have been scabbing?
couldn't you have been scabbing?
couldn't he have been scabbing?
couldn't we have been scabbing?
couldn't you have been scabbing?
couldn't they have been scabbing?